BLD: Make backports.ssl-match-hostname line ok for ordered_pip.sh

Remove whitespace from the backports.ssl-match-hostname line in
requirements_dev.txt to make it more palatable to ordered_pip.sh.

etc/requirements_dev.txt

@@ -26,7 +26,7 @@ matplotlib==1.4.3
 tornado==4.1
 pyparsing==2.0.3
 # Required by tornado
-backports.ssl-match-hostname==3.4.0.2; python_version < '3.0'
+backports.ssl-match-hostname==3.4.0.2;python_version<'3.0'
 certifi==14.5.14
 
 Markdown==2.6