Cleaup requirements.txt too

requirements.txt

 alabaster==0.7.10
-asn1crypto==0.22.0
 Babel==2.4.0
 certifi==2017.7.27.1
 chardet==3.0.4
@@ -12,13 +11,10 @@ imagesize==0.7.1
 Jinja2==2.9.6
 lockfile==0.12.2
 MarkupSafe==1.0
-ocspbuilder==0.10.2
 ocspd==0.1
-oscrypto==0.18.0
 Pygments==2.2.0
 python-daemon==2.1.2
 pytz==2017.2
-requests==2.18.3
 six==1.10.0
 snowballstemmer==1.2.1
 Sphinx==1.6.3