v4.2.7 release

Changes since v4.2.6: v4.2.6...94d4d92

Merged Pull Requests since v4.2.6:

Recommend updating grammars when releasing: #1963
Add missing ^ in regexp for Frege heuristic: #1970
Add a language grammar for Nit: #1973
Update Hy support by adding a reference to an Atom grammar: #1974
Grammar for HTTP highlighting: #1975
Grammar for AutoHotKey: #1977
More CMake samples: #1978
New grammar for Racket: #1982
Add *.sagews to languages.yml: #1989
Support for web ontology language (OWL): #1995
Add FXML to languages.yml: #1996
Add pike interpreter for Pike: #1998
Heuristics for .cs files: C# and Smalltalk: #2003
Add Rexfile: #2005