doc: Remove CLA requirement.

Closes #3036

CONTRIBUTING.md

@@ -47,8 +47,6 @@ Include as much detail as possible; we generally need to know:
 
 ## Submitting contributions
 
-- If you're a first-time contributor, please sign the [Neovim Contributor
-  License Agreement (CLA)][cla] before submitting your pull request.
 - Make it clear in the issue tracker what you are working on.
 - Be descriptive in your pull request description: what is it for, why is it
   needed, etc.
@@ -176,7 +174,6 @@ as context, use the `-W` argument as well.
 You may find it easier to instead use an interactive program for code reviews,
 such as [`tig`][tig].
 
-[cla]: https://docs.google.com/forms/d/1u54bpbwzneDIRltFx1TGi2evKxY3w0cOV3vlpj8DPbg/viewform
 [clang-format]: http://clang.llvm.org/docs/ClangFormat.html
 [clint]: clint.py
 [entry-level]: https://github.com/neovim/neovim/issues?labels=entry-level&state=open

README.md

@@ -58,8 +58,8 @@ more. See [the wiki](https://github.com/neovim/neovim/wiki/Installing-Neovim)!
 Neovim is licensed under the terms of the Apache 2.0 license, except for
 parts that were contributed under the Vim license.
 
-- Contributions committed before [b17d96][license-commit] by authors who did
-  not sign the Contributor License Agreement (CLA) remain under the Vim license.
+- Contributions committed before [b17d96][license-commit] remain under the Vim
+  license.
 
 - Contributions committed after [b17d96][license-commit] are licensed under
   Apache 2.0 unless those contributions were copied from Vim (identified in