Install instructions clarification

[erikturk]

pip install git+https://github.com/wekan/wekan-python-api-client.git#egg=wekanapi&subdirectory=src

would be clearer as

pip install 'git+https://github.com/wekan/wekan-python-api-client.git#egg=wekanapi&subdirectory=src'

Otherwise, on my centos 7 bash, the & gets interpreted.

If it's not obvious, this is my first attempt at a contribution - should I submit a pull request for the change to readme.md?