Update runtime files

runtime/compiler/racotest.vim

@@ -0,0 +1,14 @@
+" Vim compiler file
+" Compiler:     raco test (Racket command-line tools)
+" Maintainer:   D. Ben Knoble <ben.knoble+github@gmail.com>
+" URL:          https://github.com/benknoble/vim-racket
+" Last Change: 2022 Aug 12
+
+let current_compiler = 'racotest'
+
+if exists(":CompilerSet") != 2
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+CompilerSet makeprg=raco\ test\ %
+CompilerSet errorformat=location:%f:%l:%c