Fixed "Could not find "client" in the context or passed in as an option"

• minor fixes 0165c22
• fixed wrapRootElement exports 54f0b91

v1.0.7...v1.0.8

Breaking Changes

• Setting Apollo client version to use in plugin options is now deprecated. Use GATSBY_APOLLO_CLIENT_VERSION in environment variables instead.
• Accepted versions are strings of either: WITH_HOOKS | LEGACY