Allow specifying version of Codecov uploader

src/version.ts

@@ -0,0 +1,19 @@
+import * as core from '@actions/core';
+import * as fetch from 'node-fetch';
+
+const versionInfo = async (platform: string, version?: string) => {
+  if (version) {
+    core.info(`==> Running version ${version}`);
+  }
+
+  try {
+    const metadataRes = await fetch( `https://uploader.codecov.io/${platform}/latest`, {
+      headers: {'Accept': 'application/json'},
+    });
+    const metadata = await metadataRes.json();
+    core.info(`==> Running version ${metadata['version']}`);
+  } catch (err) {
+    core.info(`Could not pull latest version information: ${err}`);
+  }
+};
+export default versionInfo;