.gitignore in fast_excel-0.2.6 vs .gitignore in fast_excel-0.3.0

@@ -6,9 +6,12 @@
 gen_ffi.rb
 *.xlsx
 a.out
 .DS_Store
 *.gem
+*.cmake
+libxlsxwriter/CmakeFiles
+libxlsxwriter/CmakeCache.txt
 libxlsxwriter/dev
 libxlsxwriter/docs
 libxlsxwriter/examples
 libxlsxwriter/test
 ext/fast_excel/text_width_ext.o