Update .gitattributes

.gitattributes

@@ -8,7 +8,7 @@
 *.json linguist-documentation=false
 *.json linguist-detectable=true
 
-*.yaml linguist-vendored=false
-*.yaml linguist-generated=false
-*.yaml linguist-documentation=false
-*.yaml linguist-detectable=true
+*.yml linguist-vendored=false
+*.yml linguist-generated=false
+*.yml linguist-documentation=false
+*.yml linguist-detectable=true