Support both DRONE_COMMIT_AUTHOR and DRONE_COMMIT_AUTHOR_NAME as template {{commit.author}} variable

My droneCI send only DRONE_COMMIT_AUTHOR_NAME=Anatoly Semenov env variable, but did not send DRONE_COMMIT_AUTHOR and telegram plugin match only by
cli.StringFlag{
Name: "commit.author",
Usage: "git author name",
EnvVar: "DRONE_COMMIT_AUTHOR",
},

Could its see to both variables or add additional commit.xxx template variales ?

Start from the cli.StringFlag defining the commit.author template variable and inspect how DRONE_COMMIT_AUTHOR is read. Verify how DRONE_COMMIT_AUTHOR_NAME should be handled, then exercise the commit.author template output with each environment variable.

Written by the indexing model from the issue text.