Fix pub command on deploy (#11)

I HATE the fact PR's must be merged so the release pipeline can be properly tested.

Author: comigor

.github/workflows/push.yaml

@@ -87,4 +87,4 @@ jobs:
       - name: Publish to pub.dev
         run: |
           echo "${{ secrets.PUB_CREDENTIALS }}" > ~/.pub-cache/credentials.json
-          echo y | pub publish
+          echo y | dart pub publish

CHANGELOG.md

@@ -1,5 +1,8 @@
 # CHANGELOG
 
+## 0.3.1+4
+- Fix `pub` command on deploy.
+
 ## 0.3.1+3
 - Avoid using outdated action.
 

pubspec.yaml

@@ -1,5 +1,5 @@
 name: d20
-version: 0.3.1+3
+version: 0.3.1+4
 description: >
   D20 is a Dart library for RPG dice rolling. Supports standard notation (like "2d12", "d6+5" and "2d20-L").
 homepage: https://github.com/comigor/d20