Avoid SemVer validation error with tags like v1

.github/workflows/main.yaml

@@ -5,23 +5,7 @@ on:
 name: Main
 
 jobs:
-  example:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/setup-python@v2
-        with:
-          python-version: '3.7'
-      - uses: actions/checkout@v2
-        with:
-          # This is necessary so that we have the tags.
-          fetch-depth: 0
-      - uses: ./
-        with:
-          env-var: MY_VERSION
-          args: --style semver
-      - run: echo $MY_VERSION
-
-  complete:
+  test:
     strategy:
       matrix:
         os:
@@ -35,6 +19,7 @@ jobs:
           python-version: '3.7'
       - uses: actions/checkout@v2
         with:
+          # This is necessary so that we have the tags.
           fetch-depth: 0
       - uses: ./
         id: dunamai
@@ -42,7 +27,7 @@ jobs:
           install: '1.13.2'
           env-var: MY_VERSION
           command: dunamai from git
-          args: --style semver
+          args: --style pep440
       - if: matrix.os != 'windows-latest'
         run: echo $MY_VERSION from environment variable
       - if: matrix.os == 'windows-latest'