Merge pull request #3508 from michal-franc/go-version-recommendatio-update

Documentation - Updating golang requirement to 1.11

Author: tstromberg

docs/contributors/build_guide.md

@@ -1,5 +1,5 @@
 ### Build Requirements
-* A recent Go distribution (>1.8)
+* A recent Go distribution (>=1.11)
 * If you're not on Linux, you'll need a Docker installation
 * Minikube requires at least 4GB of RAM to compile, which can be problematic when using docker-machine