Instruct annex to add text files to Git

.gitattributes

@@ -4,4 +4,5 @@
 CHANGELOG.md annex.largefiles=nothing
 README.md annex.largefiles=nothing
 CHANGELOG.md annex.largefiles=nothing
-README.md annex.largefiles=nothing
+README.md annex.largefiles=nothing
+* annex.largefiles=((mimeencoding=binary)and(largerthan=0))