Prepare for default branch rename (#76)

Update all refs from master -> main

Author: mergify[bot]

CONTRIBUTING.md

@@ -9,7 +9,7 @@ We're so glad you're here.
 
 ### Code of Conduct
 
-Please read and understand the code of conduct found [here](https://github.com/tinkerbell/.github/blob/master/CODE_OF_CONDUCT.md).
+Please read and understand the code of conduct found [here](https://github.com/tinkerbell/.github/blob/main/CODE_OF_CONDUCT.md).
 
 ### DCO Sign Off
 

Makefile

@@ -106,9 +106,9 @@ dev-dist: dev dev-convert
 	cd ./dist && tar -czvf ../hook-${GIT_VERSION}.tar.gz ./*
 
 deploy: dist
-ifeq ($(shell git rev-parse --abbrev-ref HEAD),master)
+ifeq ($(shell git rev-parse --abbrev-ref HEAD),main)
 	s3cmd sync ./hook-${GIT_VERSION}.tar.gz s3://s.gianarb.it/hook/${GIT_VERSION}.tar.gz
-	s3cmd cp s3://s.gianarb.it/hook/hook-${GIT_VERSION}.tar.gz s3://s.gianarb.it/hook/hook-master.tar.gz
+	s3cmd cp s3://s.gianarb.it/hook/hook-${GIT_VERSION}.tar.gz s3://s.gianarb.it/hook/hook-main.tar.gz
 endif
 
 .PHONY: clean

README.md

@@ -98,7 +98,7 @@ installation environment.
 ### The automation way
 
 Sandbox has a file called
-[current_versions.sh](https://github.com/tinkerbell/sandbox/blob/master/current_versions.sh).
+[current_versions.sh](https://github.com/tinkerbell/sandbox/blob/main/current_versions.sh).
 If you change `OSIE_DOWNLOAD_LINK` with the hook link the setup.sh script will
 download the OS again and it will uncompress it in the right location
 (only if ./deploy/state/webroot/misc/osie/current does not exist)