Fixed typo

readme.textile

@@ -6,9 +6,9 @@ h2. Benefits
 
 * Ensures you and your visitors are not wasting bandwidth delivering images at a higher resolution than the vistor needs.
 * Will work on your existing site, as it requires no changes to your mark-up.
-* Is device agnostic (it simply detects the size of the visitors screen)
+* Is device agnostic (it works by detecting the size of the visitors screen)
 * Is CMS agnostic (it manages its own image re-sizing, and will work on any CMS or even on flat HTML pages)
-* Is entirely autmatic. Once added to your site, you need do no further work.
+* Is entirely automatic. Once added to your site, you need do no further work.
 * Highly configurable
 ** Set the resolutions you want to become adaptive (usually the same as the ones in your CSS @media queries)
 ** Decide whether you want to go Mobile First or Desktop First if JavaScript is unavailable