Delete references to pending issues before releasing 1.0 from readme

Yes, technicall 0 is a number, but we don't need to mention it.

Author: bdsl

README.md

@@ -162,10 +162,6 @@ Safe is loading 1000+ functions from ~85 files on each request. Yet, the perform
 In case you worry, using Safe will "cost" you ~700µs on each request. The [performance section](performance/README.md) 
 contains more information regarding the way we tested the performance impact of Safe. 
 
-## Work in progress
-
-There are a number of pending issues [before releasing 1.0](https://github.com/thecodingmachine/safe/milestone/1)
-
 ## Learn more
 
 Read [the release article on TheCodingMachine's blog](https://thecodingmachine.io/introducing-safe-php) if you want to