diff --git a/.gitignore-backup b/.gitignore-backup
deleted file mode 100644
index 49feedd..0000000
--- a/.gitignore-backup
+++ /dev/null
@@ -1,9 +0,0 @@
-node_modules
-.sass-cache
-npm-debug.log
-.idea
-dist
-lib
-tmp
-coverage
-0.md
diff --git a/README.md b/README.md
index 3ca2aae..7076d6b 100644
--- a/README.md
+++ b/README.md
@@ -70,7 +70,7 @@ See [here](https://github.com/jasonsalzman/react-add-to-calendar/blob/master/doc
 I'll do my best to stay compatible with the latest version of React. I can't guarantee support for all older versions of React.
 
 Latest compatible versions:
-- React 15.0.0 or newer
+- React 15.5.0 or newer
 
 ### Browser Support
 
diff --git a/package.json b/package.json
index 2f604d8..29e0c83 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "author": "Jason Salzman",
   "name": "react-add-to-calendar",
   "description": "A simple and reusable add to calendar button component for React",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "license": "MIT",
   "homepage": "https://github.com/jasonsalzman/react-add-to-calendar",
   "repository": {
diff --git a/src/ReactAddToCalendar.js b/src/ReactAddToCalendar.js
index 012507c..529ff27 100644
--- a/src/ReactAddToCalendar.js
+++ b/src/ReactAddToCalendar.js
@@ -18,6 +18,14 @@ export default class ReactAddToCalendar extends React.Component {
   }
 
   componentWillMount() {
+    // polyfill for startsWith to fix IE bug
+    if (!String.prototype.startsWith) {
+      String.prototype.startsWith = function(searchString, position) {
+        position = position || 0;
+        return this.indexOf(searchString, position) === position;
+      };
+    }
+
     let isCrappyIE = false;
     if (
       typeof window !== "undefined" &&
@@ -217,4 +225,4 @@ ReactAddToCalendar.defaultProps = {
     { yahoo: "Yahoo" }
   ],
   rootClass: "react-add-to-calendar"
-};
+};
\ No newline at end of file