Update gemspec

.gitattributes

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+# https://help.github.com/articles/dealing-with-line-endings
+# Set default behaviour, in case users don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files we want to always be normalized and converted 
+# to native line endings on checkout.
+*.txt text
+*.md text
+*.rb text
+*.js text
+*.html text
+*.yml text
+*.mustache text
+*.css text
+Rakefile text
+Gemfile text
+LICENSE text
+COPYRIGHT text
+gollum text
+.gitattributes text
+.gitignore text
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary