better requirements

requirements.txt

@@ -1,37 +1 @@
 -e .[socks]
-pytest-xdist
-alabaster==0.7.10
-Babel==2.4.0
-bleach==2.0.0
-certifi==2017.4.17
-chardet==3.0.3
-click==6.7
-codecov==2.0.9
-coverage==4.4.1
-decorator==4.0.11
-docutils==0.13.1
-Flask==0.12.2
-funcsigs==1.0.2
-httpbin==0.5.0
-idna==2.5
-imagesize==0.7.1
-itsdangerous==0.24
-Jinja2==2.9.6
-MarkupSafe==1.0
-mock==2.0.0
-pbr==3.0.1
-py==1.4.33
-Pygments==2.2.0
-PySocks==1.6.7
-pytest==3.1.0
-pytest-cov==2.5.1
-pytest-httpbin==0.0.7
-pytest-mock==1.6.0
-pytz==2017.2
-readme-renderer==17.2
-requests==2.16.4
-snowballstemmer==1.2.1
-Sphinx==1.5.5
-urllib3==1.21.1
-webencodings==0.5.1
-Werkzeug==0.12.2