Merge pull request github-linguist#1114 from github/2.10.13

cut a 2.10.13 release

Author: rick

github-linguist.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name    = 'github-linguist'
-  s.version = '2.10.12'
+  s.version = '2.10.13'
   s.summary = "GitHub Language detection"
   s.description = 'We use this library at GitHub to detect blob languages, highlight code, ignore binary files, suppress generated files in diffs, and generate language breakdown graphs.'