fixing typo in index.html

Ref. #18

Author: antonellamarengo

index.html

@@ -46,7 +46,7 @@
     <div class='col12 clearfix content'>
       <div class='subhead2 show-mobile'>Features.</div>
       <div class='col2 margin1 center'>Flexible import of </br> OpenStreetMap data.</div>
-      <div class='col2 margin1 center'>Handles continental sized </br> networks within miliseconds.</div>
+      <div class='col2 margin1 center'>Handles continental sized </br> networks within milliseconds.</div>
       <div class='col2 margin1 center'>Supports car, bicycle, walk modes; easily customized through profiles.</div>
       <div class='col2 margin1 social'>
         <div class='col12 clearfix '>