Update README.md

OIDCDiscoverURL misspelled as OIDCDiscoveryURL
Merge pull request #42 from ClodoaldoPinto/patch-1

Update README.md; @	ClodoaldoPinto nice catch, thanks
configure shm cache max entry size with OIDCCacheShmEntrySizeMax
add OIDCReturn401 configuration primitive, closes #41
Merge remote-tracking branch 'origin/master' into
conditional-redis-support

Conflicts:
	ChangeLog
	src/config.c
	src/mod_auth_openidc.h