Handle files with front matter only and no trailing newline (fixes #157).

lib/shared.js

@@ -7,7 +7,7 @@
 module.exports.newLineRe = /\r[\n\u0085]?|[\n\u2424\u2028\u0085]/;
 
 // Regular expression for matching common front matter (YAML and TOML)
-module.exports.frontMatterRe = /^(---|\+\+\+)$[^]*?^\1$(\r\n|\r|\n)/m;
+module.exports.frontMatterRe = /^(---|\+\+\+)$[^]*?^\1$(\r\n|\r|\n|$)/m;
 
 // Regular expression for matching inline disable/enable comments
 const inlineCommentRe =

test/front-matter-no-crlf.json

@@ -0,0 +1,4 @@
+{
+  "default": true,
+  "MD041": true
+}

test/front-matter-no-crlf.md

@@ -0,0 +1,3 @@
+---
+front: matter
+---