Add from as a JavaScript keyword (#539)

E.g.

    import { foo, bar } from './lib.mjs';

Author: mathiasbynens

distrib/prettify-small.zip

@@ -148,7 +148,7 @@ var prettyPrint;
       "for,if,in,is,isnt,loop,new,no,not,null,of,off,on,or,return,super,then," +
       "throw,true,try,unless,until,when,while,yes";
   var JSCRIPT_KEYWORDS = [COMMON_KEYWORDS,
-      "abstract,async,await,constructor,debugger,enum,eval,export,function," +
+      "abstract,async,await,constructor,debugger,enum,eval,export,from,function," +
       "get,import,implements,instanceof,interface,let,null,of,set,undefined," +
       "var,with,yield,Infinity,NaN"];
   var PERL_KEYWORDS = "caller,delete,die,do,dump,elsif,eval,exit,foreach,for," +

js-modules/prettify.js

@@ -148,7 +148,7 @@ var prettyPrint;
       "for,if,in,is,isnt,loop,new,no,not,null,of,off,on,or,return,super,then," +
       "throw,true,try,unless,until,when,while,yes";
   var JSCRIPT_KEYWORDS = [COMMON_KEYWORDS,
-      "abstract,async,await,constructor,debugger,enum,eval,export,function," +
+      "abstract,async,await,constructor,debugger,enum,eval,export,from,function," +
       "get,import,implements,instanceof,interface,let,null,of,set,undefined," +
       "var,with,yield,Infinity,NaN"];
   var PERL_KEYWORDS = "caller,delete,die,do,dump,elsif,eval,exit,foreach,for," +

loader/lang-swift.js

@@ -196,7 +196,7 @@ var prettyPrint;
       "for,if,in,is,isnt,loop,new,no,not,null,of,off,on,or,return,super,then," +
       "throw,true,try,unless,until,when,while,yes";
   var JSCRIPT_KEYWORDS = [COMMON_KEYWORDS,
-      "abstract,async,await,constructor,debugger,enum,eval,export,function," +
+      "abstract,async,await,constructor,debugger,enum,eval,export,from,function," +
       "get,import,implements,instanceof,interface,let,null,of,set,undefined," +
       "var,with,yield,Infinity,NaN"];
   var PERL_KEYWORDS = "caller,delete,die,do,dump,elsif,eval,exit,foreach,for," +

loader/prettify.js

@@ -425,7 +425,7 @@ var IN_GLOBAL_SCOPE = false;
           "for,if,in,is,isnt,loop,new,no,not,null,of,off,on,or,return,super,then," +
           "throw,true,try,unless,until,when,while,yes";
       var JSCRIPT_KEYWORDS = [COMMON_KEYWORDS,
-          "abstract,async,await,constructor,debugger,enum,eval,export,function," +
+          "abstract,async,await,constructor,debugger,enum,eval,export,from,function," +
           "get,import,implements,instanceof,interface,let,null,of,set,undefined," +
           "var,with,yield,Infinity,NaN"];
       var PERL_KEYWORDS = "caller,delete,die,do,dump,elsif,eval,exit,foreach,for," +