[release-1.6] Update cel-cpp to fix CEL seg fault#217

Merged

istio-testing merged 2 commits intoistio:release-1.6from mandarjog:cps

May 18, 2020

+11-6

Commits on May 15, 2020

Upgrade to cel-cpp v0.2.0 to pick up ANTLR thread-safety changes. (envoyproxy#514 )

TristonianJones
authored and
mandarjog
committed
emit error if an error value is returned (envoyproxy#511 )
mandarjog
committed