Update benchmarks.
Update benchmarks.

Once my PRs are in and 0.13.0 is released, we can merge this to
reflect the better performance.

ddfreyne/prometheus-docs,Cepave/openfalcon.io,dato/prometheus-docs,ddfreyne/prometheus-docs,jmptrader/docs,du2016/prometheus-docs,chosenken/docs,prometheus/docs,pdbogen/docs,tcolgate/docs,open-falcon/open-falcon.github.io,vic3lord/docs,jmptrader/docs,fabxc/docs,prometheus/docs,chosenken/docs,ddfreyne/prometheus-docs,dato/prometheus-docs,dln/docs,Cepave/openfalcon.io,tcolgate/docs,tcolgate/docs,ddfreyne/prometheus-docs,bluecmd/prometheus-docs,ChaoticMind/docs,prometheus/docs,du2016/prometheus-docs,dato/prometheus-docs,Cepave/openfalcon.io,open-falcon/open-falcon.github.io,dln/docs,vic3lord/docs,evanphx/docs,pdbogen/docs,bluecmd/prometheus-docs,jmptrader/docs,evanphx/docs,pdbogen/docs,ChaoticMind/docs,jimmidyson/docs,jimmidyson/docs,fabxc/docs,open-falcon/open-falcon.github.io,bluecmd/prometheus-docs,evanphx/docs,du2016/prometheus-docs,jimmidyson/docs,ChaoticMind/docs,vic3lord/docs,fabxc/docs,dln/docs,chosenken/docs,chosenken/docs