Update examples branch to main

Author: raphael

Makefile

@@ -83,8 +83,8 @@ release-goa:
 	# First make sure all is clean
 	git diff-index --quiet HEAD
 	cd $(GOPATH)/src/goa.design/examples && \
-		git checkout master && \
-		git pull origin master && \
+		git checkout main && \
+		git pull origin main && \
 		git diff-index --quiet HEAD
 	cd $(GOPATH)/src/goa.design/plugins && \
 		git checkout v$(MAJOR) && \
@@ -110,7 +110,7 @@ release-examples:
 		git add . && \
 		git commit -m "Release v$(MAJOR).$(MINOR).$(BUILD)" && \
 		git tag v$(MAJOR).$(MINOR).$(BUILD) && \
-		git push origin master && \
+		git push origin main && \
 		git push origin v$(MAJOR).$(MINOR).$(BUILD)
 
 release-plugins: