Version bump

[Ivshti]

bumping to 0.8

compared to the 0.6 draft, we're missing:

• Ability to update impression price dynamically, allowing real-time header bidding
• Ability to pause channels/campaigns

and compared to the 0.7 draft:

• Custom price per impression (allow setting impression price per-case #191, Event stats #192)
• eventStats: anonymized statistical data for IP location, user agent (Event stats #192)

but we also have

• EFF do not track policy
• even more advanced /analytics: more powerful stats, cached, bugfixes
• Cloudflare Origin CA added to the repo, so it's built into the Docker image
• bugfixes: namely the eventReducer 0 fix (cea6df4)
• tracking CLICK
• fixed Fix game theoretical failure #227 game theoretical failure: delegated advertiser platform #47

and some things we're not gonna add:

• Pay event, allowing the channel creator to arbitrarily pay anyone; this allows unhealthy channels to "catch up" and regain health
• statistics by ad unit