Update gitattributes as per PR discussion

via #285

Author: ianfixes

.gitattributes

@@ -12,19 +12,29 @@
 # in your working directory. In either case, they will have LF line endings in
 # the Git repository itself.
 
+# Set the default behavior, in case people don't have core.autocrlf set.
 * text=auto
 
 # Explicitly declare text files you want to always be normalized and converted
 # to native line endings on checkout. Git would likely get these right, but
 # we can be sure by adding them here.
-*.c text
-*.cpp text
-*.h text
-*.md text
-*.yaml text
-*.yml text
+*.ino   text diff=cpp
+*.c     text diff=c
+*.cc    text diff=cpp
+*.cxx   text diff=cpp
+*.cpp   text diff=cpp
+*.c++   text diff=cpp
+*.hpp   text diff=cpp
+*.h     text diff=c
+*.h++   text diff=cpp
+*.hh    text diff=cpp
+
+*.md    text
+*.yaml  text
+*.yml   text
+
 
 # Denote all files that are truly binary and should not be modified.
 # Even if we don't have any of these, they make a good example.
-*.png binary
-*.jpg binary
+*.png   binary
+*.jpg   binary