Drop IE-specific status codes workarounds and require IE10+

.travis.yml

@@ -11,7 +11,6 @@ env:
     - SAUCE_PLATFORM="Windows 7" SAUCE_BROWSER="googlechrome" SAUCE_VERSION=""
     - SAUCE_PLATFORM="Windows 7" SAUCE_BROWSER="internet explorer" SAUCE_VERSION="11"
     - SAUCE_PLATFORM="Windows 7" SAUCE_BROWSER="internet explorer" SAUCE_VERSION="10"
-    - SAUCE_PLATFORM="Windows 7" SAUCE_BROWSER="internet explorer" SAUCE_VERSION="9"
 deploy:
   provider: npm
   email: [email protected]

README.md

@@ -211,4 +211,4 @@ Firefox < 32, Chrome < 37, Safari, or IE.
 
 ![Chrome](https://raw.github.com/alrra/browser-logos/master/chrome/chrome_48x48.png) | ![Firefox](https://raw.github.com/alrra/browser-logos/master/firefox/firefox_48x48.png) | ![IE](https://raw.github.com/alrra/browser-logos/master/internet-explorer/internet-explorer_48x48.png) | ![Opera](https://raw.github.com/alrra/browser-logos/master/opera/opera_48x48.png) | ![Safari](https://raw.github.com/alrra/browser-logos/master/safari/safari_48x48.png)
 --- | --- | --- | --- | --- |
-Latest ✔ | Latest ✔ | 9+ ✔ | Latest ✔ | 6.1+ ✔ |
+Latest ✔ | Latest ✔ | 10+ ✔ | Latest ✔ | 6.1+ ✔ |

fetch.js

@@ -349,13 +349,8 @@
       }
 
       xhr.onload = function() {
-        var status = (xhr.status === 1223) ? 204 : xhr.status
-        if (status < 100 || status > 599) {
-          reject(new TypeError('Network request failed'))
-          return
-        }
         var options = {
-          status: status,
+          status: xhr.status,
           statusText: xhr.statusText,
           headers: headers(xhr),
           url: responseURL()