Fix build when using go modules (#6)

vendor/github.com/client9/misspell/url.go

@@ -0,0 +1,17 @@
+package misspell
+
+import (
+	"regexp"
+)
+
+// Regexp for URL https://mathiasbynens.be/demo/url-regex
+//
+// original @imme_emosol (54 chars) has trouble with dashes in hostname
+// @(https?|ftp)://(-\.)?([^\s/?\.#-]+\.?)+(/[^\s]*)?$@iS
+var reURL = regexp.MustCompile(`(?i)(https?|ftp)://(-\.)?([^\s/?\.#]+\.?)+(/[^\s]*)?`)
+
+// StripURL attemps to replace URLs with blank spaces, e.g.
+//  "xxx http://foo.com/ yyy -> "xxx          yyyy"
+func StripURL(s string) string {
+	return reURL.ReplaceAllStringFunc(s, replaceWithBlanks)
+}