Use Pipenv to test local development.

Pipfile

@@ -7,6 +7,7 @@ verify_ssl = true
 pre-commit = "*"
 bumpversion = "*"
 twine = "*"
+check-s3-bucket = {editable = true,path = "."}
 
 [packages]
 

Pipfile.lock

 {
     "_meta": {
         "hash": {
-            "sha256": "bbe23c390e858bdb748ab771e9f922f21dfbb7ae59874e97a2bf467d9a693272"
+            "sha256": "c8050943acf0de26c9c1c487dccf2e76fc706112362f0c5dd55f508f414a0f69"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -31,6 +31,13 @@
             ],
             "version": "==3.1.0"
         },
+        "botocore": {
+            "hashes": [
+                "sha256:50d171665ad3fc603cfc86221d98a575e07fffe3e0eadd78b341c5a7170dc563",
+                "sha256:73f176999b4b03ec194158ed3334bc4955c1c5e182cff231cc012ddfed6c96dc"
+            ],
+            "version": "==1.12.170"
+        },
         "bumpversion": {
             "hashes": [
                 "sha256:6744c873dd7aafc24453d8b6a1a0d6d109faf63cd0cd19cb78fd46e74932c77e",
@@ -60,6 +67,10 @@
             ],
             "version": "==3.0.4"
         },
+        "check-s3-bucket": {
+            "editable": true,
+            "path": "."
+        },
         "docutils": {
             "hashes": [
                 "sha256:02aec4bd92ab067f6ff27a38a38a41173bf01bed8f89157768c1573f53e474a6",
@@ -89,6 +100,13 @@
             ],
             "version": "==0.18"
         },
+        "jmespath": {
+            "hashes": [
+                "sha256:3720a4b1bd659dd2eecad0666459b9788813e032b83e7ba58578e48254e0a0e6",
+                "sha256:bde2aef6f44302dfb30320115b17d030798de8c4110e28d5cf6cf91a7a31074c"
+            ],
+            "version": "==0.9.4"
+        },
         "nodeenv": {
             "hashes": [
                 "sha256:ad8259494cf1c9034539f6cced78a1da4840a4b157e23640bc4a0c0546b0cb7a"
@@ -117,6 +135,14 @@
             ],
             "version": "==2.4.2"
         },
+        "python-dateutil": {
+            "hashes": [
+                "sha256:7e6584c74aeed623791615e26efd690f29817a27c73085b78e4bad02493df2fb",
+                "sha256:c89805f6f4d64db21ed966fda138f8a5ed7a4fdbc1a8ee329ce1b74e3c74da9e"
+            ],
+            "markers": "python_version >= '2.7'",
+            "version": "==2.8.0"
+        },
         "pyyaml": {
             "hashes": [
                 "sha256:57acc1d8533cbe51f6662a55434f0dbecfa2b9eaf115bede8f6fd00115a0c0d3",
@@ -188,6 +214,7 @@
                 "sha256:b246607a25ac80bedac05c6f282e3cdaf3afb65420fd024ac94435cabe6e18d1",
                 "sha256:dbe59173209418ae49d485b87d1681aefa36252ee85884c31346debd19463232"
             ],
+            "markers": "python_version >= '3.4'",
             "version": "==1.25.3"
         },
         "virtualenv": {