Update to ubunto-latest

Author: dylannguyen11195

.github/workflows/ci.yaml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: [3.6, 3.7, 3.8]
@@ -45,7 +45,7 @@ jobs:
           path: .coverage
 
   deploy:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     needs: test
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
 
@@ -60,7 +60,7 @@ jobs:
       - name: Upgrade pip and setuptools
         run: |
           python -m pip install --upgrade pip setuptools
-          
+
       - name: Install dependencies
         run: pip install twine wheel