Fix type and broken link in README.md (#119)

* Fix type of option "mismatchThreshold"

* Fix broken link

Author: ljpengelen

README.md

@@ -199,14 +199,14 @@ See [API.md](API.md) for a full list of API calls and examples.
 |`imageSnapshotPath`|`string`|no|Stores reference screenshots in this directory|./differencify_reports|
 |`saveDifferencifiedImage`|`boolean`|no|Save differencified image to test report path in case of mismatch|true|
 |`saveCurrentImage`|`boolean`|no|Save the captured image from current test run to test report path|true|
-|`mismatchThreshold`|`integer`|no|Difference tolerance between reference/test image|0.001|
+|`mismatchThreshold`|`number`|no|Difference tolerance between reference/test image|0.001|
 
 ## TestOptions
 
 |Parameter|type|required|description|default|
 |---------|----|--------|-----------|-------|
 |`testName`|`string`|no|Unique name for your test case|test|
-|`chain`|`boolean`|no|Whether to chain differencify commands or not. More details on [examples](examples)|true|
+|`chain`|`boolean`|no|Whether to chain differencify commands or not. See [API.md](API.md) for more details|true|
 
 ## Steps API