ci: list sstore and zero_knowledge jobs in tox's envlist.

Author: veox

tox.ini

@@ -2,7 +2,7 @@
 envlist=
     py{36,37}-{core,p2p,integration,lightchain_integration,eth2-core,eth2-fixtures,eth2-integration,plugins}
     py{36}-long_run_integration
-    py{36}-rpc-state-{frontier,homestead,tangerine_whistle,spurious_dragon,byzantium,constantinople,petersburg,quadratic}
+    py{36}-rpc-state-{frontier,homestead,tangerine_whistle,spurious_dragon,byzantium,constantinople,petersburg,quadratic,sstore,zero_knowledge}
     py{36}-rpc-blockchain
     py{36,37}-libp2p
     py{36,37}-lint