Add full test

Author: jcs090218

.github/workflows/test.yml

@@ -15,6 +15,12 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest]
         emacs_version:
+          - 25.1
+          - 25.2
+          - 25.3
+          - 26.1
+          - 26.2
+          - 26.3
           - 27.1
           - snapshot
 
@@ -33,6 +39,12 @@ jobs:
     strategy:
       matrix:
         emacs-version:
+          - 25.1
+          - 25.2
+          - 25.3
+          - 26.1
+          - 26.2
+          - 26.3
           - 27.1
           - snapshot