Swap failing CircleCI status for passing GH Action

I'm ambivalent about Circle vs. Actions, but the former is failing
missing a key in order to clone the repo, and I think I lack access to
fix that. Since it's only a simple workflow, seemed easiest to recreate
in Actions - and as that passes (as of
d62f162) it seems to make more sense to
use that for a nice green status than red from Circle.

.github/workflows/main.yml

@@ -14,3 +14,8 @@ jobs:
 
       - name: Compile
         run: make
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: examples
+          path: examples/*.pdf

README.md

@@ -14,8 +14,8 @@
   <a href="https://www.paypal.me/posquit0">
     <img alt="Donate" src="https://img.shields.io/badge/Donate-PayPal-blue.svg" />
   </a>
-  <a href="https://circleci.com/gh/posquit0/Awesome-CV">
-    <img alt="CircleCI" src="https://circleci.com/gh/posquit0/Awesome-CV.svg?style=shield" />
+  <a href="https://github.com/posquit0/Awesome-CV/actions/workflows/main.yml">
+    <img alt="GitHub Actions" src="https://github.com/posquit0/Awesome-CV/actions/workflows/main.yml/badge.svg" />
   </a>
   <a href="https://raw.githubusercontent.com/posquit0/Awesome-CV/master/examples/resume.pdf">
     <img alt="Example Resume" src="https://img.shields.io/badge/resume-pdf-green.svg" />