Add route for legislators method

Toward #5.

htdocs/1.1/.htaccess

@@ -5,6 +5,7 @@ RewriteRule ^section-video/(.*).json$ code-section-video.php?section=$1 [QSA]
 RewriteRule ^photosynthesis/([a-z0-9]{5}).json$ photosynthesis.php?hash=$1 [QSA]
 RewriteRule ^bills/([0-9]{4}).json$ bills.php?year=$1 [QSA]
 RewriteRule ^bill/([0-9]{4})/([A-Za-z0-9]+).json$ bill.php?year=$1&bill=$2 [QSA]
+RewriteRule ^legislators.json$ legislators.php [QSA]
 RewriteRule ^legislator/([a-z]+).json$ legislator.php?shortname=$1 [QSA]
 
 # By default, API data expires in just one hour.