Update README.md files, see phetsims/chipper#1157

README.md

@@ -29,8 +29,6 @@ git clone https://github.com/phetsims/chipper.git
 git clone https://github.com/phetsims/dot.git
 git clone https://github.com/phetsims/joist.git
 git clone https://github.com/phetsims/kite.git
-git clone https://github.com/phetsims/perennial.git
-git clone https://github.com/phetsims/perennial.git perennial-alias
 git clone https://github.com/phetsims/perennial.git perennial-alias
 git clone https://github.com/phetsims/phet-core.git
 git clone https://github.com/phetsims/phetcommon.git
@@ -51,17 +49,16 @@ git clone https://github.com/phetsims/utterance-queue.git
 ```
 cd chipper
 npm install
-cd ../perennial
-npm install
 cd ../perennial-alias
 npm install
 cd ../trig-tour
 npm install
 ```
 
-(3) Change directory to chipper `cd ../chipper/`, then transpile the code to JavaScript by running `node js/scripts/transpile.js --watch`
+(3) Change directory to chipper `cd ../chipper/`, then transpile the code to JavaScript by running `node js/scripts/transpile.js --watch`. This starts a file-watching process
+that will automatically transpile new or changed files.
 
-(4) Start an http-server
+(4) In a new terminal/command prompt, start an http-server
 
 (5) Open in the browser: `http://localhost/trig-tour/trig-tour_en.html` (You will probably need to modify this URL based on your HTTP port and relative path.)