docs: fix broken ecosystem link (#4222)

I put it as the awesome repo ecosytem section as this is currently the only place where there is tendermint only ecosystem information.

- closes #4198

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

abci/README.md

@@ -8,7 +8,7 @@ can manage an application state running in another.
 
 Previously, the ABCI was referred to as TMSP.
 
-The community has provided a number of additional implementations, see the [Tendermint Ecosystem](https://tendermint.com/ecosystem)
+The community has provided a number of additional implementations, see the [Tendermint Ecosystem](https://github.com/tendermint/awesome#ecosystem)
 
 
 ## Installation & Usage