Revert "Skip pnpm repos for now (#73)"

This reverts commit 85ec996.

Author: amcasey

src/main.ts

@@ -710,10 +710,6 @@ async function installPackages(repoDir: string, commands: readonly ip.InstallCom
         for (const { directory: packageRoot, tool, arguments: args } of commands) {
             if (timedOut) break;
 
-            if (tool === ip.InstallTool.Pnpm) {
-                throw new Error("Skipping pnpm for now");
-            }
-
             usedYarn = usedYarn || tool === ip.InstallTool.Yarn;
 
             const elapsedMs = performance.now() - startMs;