Updated release

Changelog for 0.8.2:

• PR #22 Add variable to select an existing secret for tls by @jsiebens

Commits
70fc5bb Update Chart version by @alexellis
b428dcd Add variable to select an existing secret for tls by @jsiebens
88988eb Update syntax by @alexellis
a9447a8 Update notes by @alexellis
3477346 Update README.md by @alexellis
36f81ce Update README.md by @alexellis
412128b Create README.md by @alexellis
461628b Add upstream variable, update Docker image version by @alexellis

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