bump version number

Author: krvajal

package.json

@@ -2,7 +2,7 @@
     "name": "linter-gfortran",
     "displayName": "Modern Fortran",
     "description": "Modern Fortran language support, including syntax highlighting and error detection.",
-    "version": "0.5.0",
+    "version": "0.5.1",
     "publisher": "krvajalm",
     "engines": {
         "vscode": "^1.10.0"