Add kotlin 1.6 to test matrix
Contents of README.google:
Name: Kotlin
URL: https://github.com/JetBrains/kotlin/
Version: 1.6.0
Revision: NA
License: Apache License Version 2.0
Bug: 207645616
Change-Id: I624726cbc0895cda4e1c031a63136ad86fa49261
diff --git a/.gitignore b/.gitignore
index d1bacd1..052f0a6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -114,6 +114,8 @@
third_party/kotlin/kotlin-compiler-1.4.20
third_party/kotlin/kotlin-compiler-1.5.0.tar.gz
third_party/kotlin/kotlin-compiler-1.5.0
+third_party/kotlin/kotlin-compiler-1.6.0.tar.gz
+third_party/kotlin/kotlin-compiler-1.6.0
third_party/kotlin/kotlin-compiler-dev.tar.gz
third_party/kotlin/kotlin-compiler-dev
third_party/kotlinx-coroutines-1.3.6.tar.gz