Replace TravisCI with GitLab CI.

Also:

- Update the README.
- Test more environments (every supported CPythong and PyPy version and
CPython 2.7).

.gitlab-ci.yml

+---
+stages:
+  - lint
+  - test
+
+pre-commit:
+  stage: lint
+  image: adarnimrod/ci-images:pre-commit
+  variables: &variables
+    XDG_CACHE_HOME: "$CI_PROJECT_DIR/.cache"
+    PIPENV_VENV_IN_PROJECT: "1"
+    LANG: C.UTF-8
+  before_script:
+    - apt-get update
+    - apt-get install -y libdbus-1-dev
+    - pipenv install --dev && rm pyproject.toml
+  script:
+    - pipenv run lint
+  cache: &cache
+    key: "$CI_JOB_NAME"
+    paths:
+      - .cache/
+      - .venv/
+
+test:
+  stage: test
+  image: $project:$version-slim
+  allow_failure: true
+  before_script:
+    - apt-get update
+    - >-
+      apt-get install -y
+      bats
+      build-essential
+      git
+      libdbus-1-dev
+      libffi-dev
+      libglib2.0-dev
+      libssl-dev
+    - |-
+      if [ "$project" = 'pypy' ]
+      then
+        ln -sf /opt/pypy/bin/pypy "/usr/local/bin/python$version"
+      fi
+    - pip install pipenv
+    - pipenv install --dev --python=$version
+  script:
+    - pipenv run bats
+    - pipenv run check
+    - pipenv run doctest
+    - pipenv run build
+  variables:
+    <<: *variables
+    PIPENV_SKIP_LOCK: 1
+  cache: *cache
+  parallel:
+    matrix:
+      - project: python
+        version:
+          - "2.7"
+          - "3.6"
+          - "3.7"
+          - "3.8"
+          - "3.9"
+      - project: pypy
+        version:
+          - "2.7"
+          - "3.6"
+          - "3.7"

.travis.yml

-# vim:ff=unix ts=2 sw=2 ai expandtab
----
-language: python
-python:
-  - "2.7"
-  - "3.5"
-  - "3.6"
-  - "3.7"
-dist: xenial
-sudo: false
-cache:
-  - pip
-  - $HOME/.pre-commit
-
-matrix:
-  include:
-    - python: "3.7"
-      env:
-        PIPENV_IGNORE_VIRTUALENVS: "1"
-      install:
-        - pipenv install --dev
-      addons:
-        apt:
-          packages:
-            - libdbus-1-dev
-            - libglib2.0-dev
-      script:
-        - pipenv run lint
-        - pipenv run check
-
-install:
-  - git clone --depth 1 https://github.com/bats-core/bats-core "$HOME/bats"
-  - pip install . | cat
-
-env:
-  PATH: "$PATH:$HOME/bats/bin:$HOME/.local/bin"
-
-script:
-  - bats -t tests/
-  - python -m doctest template/*.py
-
-notifications:
-  email: false

MANIFEST.in

@@ -2,7 +2,7 @@ recursive-include template *.py
 include *.rst
 include *.txt
 exclude .pre-commit-config.yaml
-exclude .travis.yml
+exclude .gitlab-ci.yml
 exclude .gitignore
 exclude Pipfile*
 exclude tests

README.rst

 Template
 ########
 
-.. image:: https://travis-ci.org/adarnimrod/template.svg?branch=master
-    :target: https://travis-ci.org/adarnimrod/template
+.. image:: https://git.shore.co.il/nimrod/template/badges/master/pipeline.svg
+    :target: https://git.shore.co.il/nimrod/template/-/commits/master
 
 A CLI tool for generating files from `Jinja2 <http://jinja.pocoo.org/>`_
-templates and environment variables. Tested on Python versions 2.7, 3.5 and
-later.
+templates and environment variables.
 
 Examples
 --------
@@ -50,7 +49,7 @@ The following Jinja filters were added:
   query language.
 - :code:`run`: Runs a command and returns the stdout, stderr and returncode
   using `run
-  <https://docs.python.org/3.5/library/subprocess.html?highlight=popen#subprocess.run>`_.
+  <https://docs.python.org/3.6/library/subprocess.html?highlight=popen#subprocess.run>`_.
 
 Example usage can be seen in :code:`tests` and for specific filters in the
 docstrings in :code:`template/filters.py`.
@@ -58,28 +57,28 @@ docstrings in :code:`template/filters.py`.
 Testing
 -------
 
-Tests require Python 3.7, `pipenv <https://docs.pipenv.org>`_ and
-`Bats <https://github.com/bats-core/bats-core>`_. Run the tests with the
+Tests require `Pipenv <https://docs.pipenv.org>`_ and `Bats
+<https://github.com/bats-core/bats-core>`_. Run the tests with the
 following commands:
 
 .. code:: shell
 
    pipenv run lint  # Pre-commit hooks.
-   pipenv run check  # Twine check.
    pipenv run doctest  # Doc tests.
    pipenv run bats  # Bats tests.
+   pipenv run check  # Twine check.
 
-Also, Travis CI is setup for this project so every push to this repository is
-checked with all supported Python versions.
+Also, GitLab CI is setup for this project so every push to this repository is
+checked with all Python 2.7, Python 3.6 and later and all supported versions of
+PyPy.
 
 Release
 -------
 
-Release requires Python 3.7 and `pipenv <https://docs.pipenv.org>`_. To bump the
-version run :code:`pipenv run bumpversion major|minor|patch` to update the
-version and git commit and tag. Then run :code:`pipenv run upload` to upload the
-new version to PyPI and :code:`git push --follow-tags` to push the git commit
-and tag.
+Release requires `Pipenv <https://docs.pipenv.org>`_. To bump the version run
+:code:`pipenv run bumpversion major|minor|patch` to update the version and git
+commit and tag. Then run :code:`pipenv run upload` to upload the new version to
+PyPI and :code:`git push --follow-tags` to push the git commit and tag.
 
 License
 -------
@@ -93,11 +92,9 @@ Author
 Nimrod Adar, `contact me <nimrod@shore.co.il>`_ or visit my `website
 <https://www.shore.co.il/>`_. Patches are welcome via `git send-email
 <http://git-scm.com/book/en/v2/Git-Commands-Email>`_. The repository is located
-at: https://www.shore.co.il/git/.
+at: https://git.shore.co.il/nimrod/.
 
 Pending tasks
 -------------
 
-- Release on tagged commits to PyPI in Travis CI
-  (https://docs.travis-ci.com/user/deployment/pypi/ and
-  https://docs.travis-ci.com/user/encryption-keys/).
+- Release on tagged commits to PyPI in CI.