title: watchify : The term 'watchify' is not recognized as the name of a cmdlet
body: <p>I have tried the following command </p>
  
  <pre><code>npm install react browserify watchify 6to5ify --save-dev 
  </code></pre>
  
  <p>and then i tried this </p>
  
  <pre><code> watchify -t 6to5ify ./app.jsx ./bundle.js -v
  </code></pre>
  
  <p>but it complains that</p>
  
  <pre><code>watchify : The term 'watchify' is not recognized as the name of a cmdlet, function, script file, or operable program.
  Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
  At line:1 char:1
  + watchify -t 6to5ify ./app.jsx ./bundle.js -v
  + ~~~~~~~~
      + CategoryInfo          : ObjectNotFound: (watchify:String) [], CommandNotFoundException
      + FullyQualifiedErrorId : CommandNotFoundException
  </code></pre>
  
  <p>I tried to install watchify again using:</p>
  
  <pre><code>npm install watchify
  </code></pre>
  
  <p>and i am sure it is installed 
  <a href="https://i.stack.imgur.com/wfgQH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wfgQH.png" alt="enter image description here"></a></p>
  
  <p>but i have still the same problem.</p>