[docs] Update compatibility table

Author: kostorr

README.md

@@ -559,7 +559,7 @@ In order to use a CRU the package versions have to adhere to the following table
 | v0.15.0     | v3.5.1        | v2.4.0         | v1.0.4+     | v12.0.0      |
 | v0.16.0     | v3.5.2        | v2.4.0         | v1.0.4+     | v12.0.0      |
 | v0.19.2     | v3.5.2        | v2.4.1         | v1.0.4+     | v12.0.0      |
-| TBR         | v3.5.2        | v2.6.1         | v1.0.4+     | v12.0.0      |
+| v0.21.1     | v3.6.1        | v2.6.1         | v1.0.4+     | v12.0.0      |
 
 The _PDA Driver_ entry refers to the `pda-kadapter-dkms-*.rpm` package which is availabe through the [o2-daq-yum](http://alice-daq-yum-o2.web.cern.ch/alice-daq-yum-o2/cc7_64/) repo as an RPM.