add .gitattributes for Ruby method detection

The "diff" function detection for C does not map well to
Ruby files, take advantage of gitattributes(5) to improve
method name detection in generated patches as well as
making "git diff -W" output more useful.

1 files changed, 4 insertions, 0 deletions

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..cfedc1f
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+*.gemspec diff=ruby
+*.rb diff=ruby
+Rakefile diff=ruby
+bin/* diff=ruby