Use pip install -e .

Without `-e`, driver is installed into site-packages, and then installed
version conflicts with source. This has caused me problems many times
during development, because source version doesn't work (native libraries)
are not compiled.

`-e` causes driver to be installed in-place, so there are no more conflicts
and import issues.

Author: Lorak-mmk

ci/run_integration_test.sh

@@ -23,7 +23,7 @@ pip install -U pip wheel setuptools
 
 # install driver wheel
 pip install --ignore-installed -r test-requirements.txt pytest
-pip install .
+pip install -e .
 
 # download awscli
 pip install awscli