Upgraded dependency of html5lib

Author: stevenroose

pubspec.yaml

@@ -21,7 +21,7 @@ dependencies:
   code_transformers: '>=0.1.4+2 <0.2.0'
   collection: '>=0.9.1 <1.0.0'
   di: '>=3.3.1 <4.0.0'
-  html5lib: '>=0.10.0 <0.11.0'
+  html5lib: '>=0.10.0 <0.13.0'
   intl: '>=0.8.7 <0.12.0'
   observe: '>=0.10.0+1 <0.11.0'
   perf_api: '>=0.0.9 <0.1.0'