Changing yaml files to track main branch PR's

Author: munozemilio

build/botframework-cli-daily.yml

@@ -16,7 +16,7 @@ schedules:
   displayName: Daily midnight build (UTC Time)
   branches:
     include:
-    - master
+    - main
 
 variables:
 - template: botframework-cli-version.yml  # Template reference ${{ variables.releaseVersion }}

build/botframework-cli-mac.yml

@@ -11,7 +11,7 @@ pool:
 pr:
   branches:
     include:
-     - master
+     - main
   paths:
     include:
       - '*'

build/botframework-cli.yml

@@ -11,7 +11,7 @@ pool:
 pr:
   branches:
     include:
-     - master
+     - main
 
 jobs:
   - job: CLI