[R-package] ignore temp files created by R on Mac (#3388)

.gitignore

@@ -427,6 +427,7 @@ miktex*.zip
 
 # Files from interactive R sessions
 .Rproj.user
+**/.Rapp.history
 **/.Rhistory
 
 # Files generated by aspell

R-package/.Rbuildignore

@@ -6,6 +6,7 @@ AUTOCONF_UBUNTU_VERSION
 ^docs/.*$
 ^.*\.dll
 \.gitkeep$
+^.*\.history
 ^Makefile$
 ^.*\.o
 ^.*\.out