Adjust tag prefix for releases (#6)

Author: dhardy

.github/workflows/release.yml

@@ -1,7 +1,7 @@
 name: Make releases from tags
 on:
   push:
-    tags: ['[0-9]+.[0-9]+.[0-9]+']
+    tags: ['v[0-9]+.[0-9]+.[0-9]+']
 
 jobs:
   publish: