Clarify contribution licensing

This is similar to https://github.com/apple/swift/blob/master/CONTRIBUTING.md with an explicit clause that allows changing license for #1073.
fmtlib · Mar 11, 2019 · 8daa3c6 · 8daa3c6
1 parent 0d418a8
commit 8daa3c6
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -1,6 +1,11 @@
 Contributing to {fmt}
 =====================
 
+By submitting a pull request or a patch, you represent that you have the right
+to license your contribution to the {fmt} project owners and the community, and
+agree that your contributions are licensed under the {fmt} license that may
+change in the future.
+
 All C++ code must adhere to [Google C++ Style Guide](
 https://google.github.io/styleguide/cppguide.html) with the following
 exceptions: