Bazel extension clobbers F# build script language detection.

[baronfel]

Hi,

In the F# community we often use a build dsl called FAKE, which uses normal F# language scripts (*.fsx files) to run the build. The convention is to call these files "build.fsx", which unfortunately conflicts with the filenamePatterns that are defined in this project here. Is there another way to define this pattern that doesn't conflict in this way?

[devoncarew]

I believe the bazel ones are case sensitive and upper case. Perhaps the regex could be updated to be case sensitive?

[devoncarew]

Likely fixed by #13.