Revert "Bump python 396 (singer-io#130)" (singer-io#131)

* Revert "Bump python 396 (singer-io#130)"

This reverts commit f229588.

* change uninstallable 3.5.2 to 3.5.6

* Bump to v0.2.1

Author: zachharris1

.circleci/config.yml

@@ -20,6 +20,7 @@ jobs:
             source dev_env.sh
             export LC_ALL=C
             apt install -y libpq-dev
+            pyenv local 3.5.6
             python3 -m venv /usr/local/share/virtualenvs/tap-postgres
             source /usr/local/share/virtualenvs/tap-postgres/bin/activate
             pip install -U 'pip<19.2' 'setuptools<51.0.0'
@@ -34,7 +35,8 @@ jobs:
           command: |
             source dev_env.sh
             source /usr/local/share/virtualenvs/tap-tester/bin/activate
-            pip install psycopg2==2.8.6
+            apt install -y libpq-dev
+            pip install psycopg2==2.8.4
             run-test --tap=tap-postgres tests
       - slack/notify-on-failure:
           only_for_branches: master

setup.py

@@ -3,14 +3,14 @@
 from setuptools import setup
 
 setup(name='tap-postgres',
-      version='0.2.0',
+      version='0.2.1',
       description='Singer.io tap for extracting data from PostgreSQL',
       author='Stitch',
       url='https://singer.io',
       classifiers=['Programming Language :: Python :: 3 :: Only'],
       install_requires=[
           'singer-python==5.3.1',
-          'psycopg2==2.8.6',
+          'psycopg2==2.7.4',
           'strict-rfc3339==0.7',
       ],
       extras_require={