0.9.3

Changelog

84cca1f Add Logf() as the standard way to log from a check
03df6b1 Add an explicit Line field to Message
1f07d60 Add field identifier checks
557e331 Document how to enable or disable checks
2b0e5d6 Move the input files test closer to linter creation
44bb276 Rename Includes to Strings
26c745a Report parse errors are first-class error messages (#11)
f8694f8 Return pointers to Check structures
88b61c9 Simplify TestMessageString
674876e Standardize the checks unit test pattern (#10)
cff5c39 Stop exporting the context's Logger