fix(isDataURI): fix dataURI mediaType format (#1916)

* fix(isDataURI): fix dataURI mediaType format

* fix(isDataURI): add test dataURI for mediaType with dots

* fix(isDataURI): fix test dataURI for mediaType with dots

Author: temoffey

src/lib/isDataURI.js

@@ -1,6 +1,6 @@
 import assertString from './util/assertString';
 
-const validMediaType = /^[a-z]+\/[a-z0-9\-\+]+$/i;
+const validMediaType = /^[a-z]+\/[a-z0-9\-\+\.]+$/i;
 
 const validAttribute = /^[a-z\-]+=[a-z0-9\-]+$/i;
 

test/validators.js

@@ -10199,6 +10199,7 @@ describe('Validators', () => {
         ' data:text/html,%3Ch1%3EHello%2C%20World!%3C%2Fh1%3E',
         'data:,A%20brief%20note',
         'data:text/html;charset=US-ASCII,%3Ch1%3EHello!%3C%2Fh1%3E',
+        'data:application/vnd.openxmlformats-officedocument.wordprocessingml.document;base64,dGVzdC5kb2N4',
       ],
       invalid: [
         'dataxbase64',