Update CLA instructions

CONTRIBUTING.md

@@ -50,14 +50,14 @@ We love pull requests.  We strive to promptly review them, provide feedback, and
 
 ## Contributor License Agreement (CLA)
 
-Before we can merge a pull request, we require a signed Contributor License Agreement.  There is a CLA for:
+Before we can review a pull request, we require a signed Contributor License Agreement.  There is a CLA for:
 
-* [individuals](Documentation/Contributors/CLAs/individual-cla-agi-v1.0.txt) and
-* [corporations](Documentation/Contributors/CLAs/corporate-cla-agi-v1.0.txt).
+* [individuals](https://docs.google.com/forms/d/e/1FAIpQLScU-yvQdcdjCFHkNXwdNeEXx5Qhu45QXuWX_uF5qiLGFSEwlA/viewform) and
+* [corporations](https://docs.google.com/forms/d/e/1FAIpQLSeYEaWlBl1tQEiegfHMuqnH9VxyfgXGyIw13C2sN7Fj3J3GVA/viewform).
 
 This only needs to be completed once, and enables contributions to all of the projects under the [Analytical Graphics Inc](https://github.com/AnalyticalGraphicsInc) organization, including CesiumJS.  The CLA ensures you retain copyright to your contributions, and provides us the right to use, modify, and redistribute your contributions using the [Apache 2.0 License](LICENSE.md).
 
-Please email a completed CLA with all fields filled in to [cla@agi.com](mailto:cla@agi.com).  Related questions are also welcome.
+If you have any questions, feel free to reach out to [hello@cesium.com](mailto:hello@cesium)!
 
 ## Pull Request Guidelines
 

CONTRIBUTORS.md

@@ -1,6 +1,6 @@
 See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to CesiumJS.  The following people have contributed to CesiumJS, under the following agreements:
 
-## [Corporate CLA](Documentation/Contributors/CLAs/corporate-cla-agi-v1.0.txt)
+## [Corporate CLA](Documentation/Contributors/CLAs/corporate-contributor-license-agreement-v1.0.pdf)
 
 * [Analytical Graphics, Inc.](http://www.agi.com/)
    * [Patrick Cozzi](https://github.com/pjcozzi)
@@ -128,7 +128,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to Cesiu
 * [Cesium GS, Inc.](https://cesium.com/)
    * [Tom Fili](https://github.com/tfili)
 
-## [Individual CLA](Documentation/Contributors/CLAs/individual-cla-agi-v1.0.txt)
+## [Individual CLA](Documentation/Contributors/CLAs/individual-contributor-license-agreement-v1.0.pdf)
 * [Victor Berchet](https://github.com/vicb)
 * [Caleb Morse](https://github.com/cmorse)
 * [Ravi Agrawal](https://github.com/macoda)