Clarify compiler optimization warning

Author: cgewecke

README.md

@@ -36,8 +36,7 @@ truffle run coverage [command-options]
 + Coverage launches its own in-process ganache server.
 + You can set [ganache options][1] using the `providerOptions` key in your `.solcover.js` [config][15].
 + Coverage [distorts gas consumption][13]. Tests that check exact gas consumption should be [skipped][24].
-+ Coverage runs your compiler with **optimization off**. 
-  + :warning: Please report all unexpected compilation faults to issue #417 :warning:
++ :warning:  Contracts are compiled **without optimization**. Please report unexpected compilation faults to [issue 417][25] 
 
 ## Command Options
 | Option <img width=200/> | Example <img width=750/>| Description <img width=1000/> |
@@ -152,3 +151,4 @@ $ yarn
 [22]: https://cdn-images-1.medium.com/max/800/1*uum8t-31bUaa6dTRVVhj6w.png
 [23]: https://github.com/sc-forks/solidity-coverage/blob/beta/docs/advanced.md#workflow-hooks
 [24]: https://github.com/sc-forks/solidity-coverage/blob/beta/docs/advanced.md#skipping-tests
+[25]: https://github.com/sc-forks/solidity-coverage/issues/417