update tkn to 0.4.0

Author: danielhelfand

.workshop/build

@@ -20,7 +20,7 @@ mv -f code/* . && rmdir code
 mkdir -p .bin && echo "export PATH=$HOME/.bin:$PATH" >> .bash_profile
 
 # Releases for Tekton CLI at: https://github.com/tektoncd/cli/releases
-TKN_CLI_VERSION=0.3.1
+TKN_CLI_VERSION=0.4.0
 curl -kL https://github.com/tektoncd/cli/releases/download/v${TKN_CLI_VERSION}/tkn_${TKN_CLI_VERSION}_Linux_x86_64.tar.gz -o /tmp/tkn.tar.gz && \
 tar -xvzf /tmp/tkn.tar.gz -C /tmp && \
 chmod 755 /tmp/tkn && \