Update project.clj
Update project.clj

change `[reagent "0.6.0-RC"]` to `[reagent "0.6.0-rc"]`.
Error message was

```
Could not find artifact reagent:reagent:jar:0.6.0-RC in central (https://repo1.maven.org/maven2/)
Could not find artifact reagent:reagent:jar:0.6.0-RC in clojars (https://clojars.org/repo/)
```
enterlab/rente