use python-ldap 3.0.0

dev_requirements.txt

-pyldap>=2.4.28  # here instead of requirements.txt so rtfd can build
+pyldap>=3.0.0  # here instead of requirements.txt so rtfd can build
 Sphinx>=1.5.5
 
 -r requirements.txt

setup.py

@@ -22,7 +22,7 @@ setup(
     platforms='any',
     install_requires=[
         'Flask>=0.12.4',
-        'pyldap'
+        'python-ldap>=3.0.0'
     ],
     classifiers=[
         'Environment :: Web Environment',