Use newly published mustache version for dartdoc

Author: jcollins-g

pubspec.yaml

@@ -19,7 +19,7 @@ dependencies:
   logging: ^0.11.3+1
   process: ^3.0.5
   markdown: ^2.0.0
-  mustache: ^1.0.2
+  mustache: ^1.1.0
   package_config: '>=0.1.5 <2.0.0'
   path: ^1.3.0
   pub_semver: ^1.3.7
@@ -43,7 +43,3 @@ dev_dependencies:
 
 executables:
   dartdoc: null
-
-dependency_overrides:
-  mustache:
-    path: '../mustache'