Add removeArtifacts (#109)

lib/Inputs.js

@@ -117,6 +117,10 @@ class CoreInputs {
             return undefined;
         return this.createdPrerelease;
     }
+    get removeArtifacts() {
+        const removes = core.getInput('removeArtifacts');
+        return removes == 'true';
+    }
     get replacesArtifacts() {
         const replaces = core.getInput('replacesArtifacts');
         return replaces == 'true';