build(npm): Remove updating npm

Author: mediumTaj

appveyor.yml

@@ -25,8 +25,6 @@ install:
 - cmd: >-
     pip install git+git://github.com/smsearcy/bumpversion.git@issue-135
 
-    npm install -g npm
-
     npm install @semantic-release/exec
 
     npm install @semantic-release/git