Handle quoted strings in data url (#84)

* handle quoted strings in data url

* unrefactor

* update package json

* Revert "update package json"

This reverts commit 9446109b0f94d9e569a961642f1e57b1a67793ee.

* change background-image to border-image

src/snapshot.ts

@@ -69,7 +69,7 @@ function extractOrigin(url: string): string {
   return origin;
 }
 
-const URL_IN_CSS_REF = /url\((?:(')([^']*)'|(")([^"]*)"|([^)]*))\)/gm;
+const URL_IN_CSS_REF = /url\((?:(')([^']*)'|(")(.*?)"|([^)]*))\)/gm;
 const RELATIVE_PATH = /^(?!www\.|(?:http|ftp)s?:\/\/|[A-Za-z]:\\|\/\/|#).*/;
 const DATA_URI = /^(data:)([^,]*),(.*)/i;
 export function absoluteToStylesheet(