Rename .js things that should be treated as ES6 modules to .jsm.

...so Node will load them as such.

Author: erikrose

clusters.js renamed to clusters.mjs

@@ -15,12 +15,14 @@
  *   over, loosening constraints each time, if it fails
  * * Happily finds body text in things other than divs and p tags.
  */
+import {argv} from 'process';
 import {readFileSync} from 'fs';
 import {dirname, join} from 'path';
 
 import leven from 'leven';
 
 import {dom, props, out, rule, ruleset, score, type} from '../index';
+import {Annealer} from '../optimizers';
 import {domSort, inlineTextLength, linkDensity, staticDom} from '../utils';
 
 
@@ -217,8 +219,6 @@ function readabilityDocPairs() {
 if (require.main === module) {
     // By default, just run the Readability examples and show how our current
     // coefficients score on them.
-    import {Annealer} from '../optimizers';
-    import {argv} from 'process';
 
     let coeffs = [1.5, 4.5, 2, 6.5, 2, 0.5, 0];