Update link to Michael Stapelberg's German introduction talk
Update link to Michael Stapelberg's German introduction talk

He gave a more up-to-date version of his previous talk at Easterhegg
2016. I think it makes more sense to link the newer talk here instead
of the old one.

open-falcon/open-falcon.github.io,chosenken/docs,ddfreyne/prometheus-docs,pdbogen/docs,du2016/prometheus-docs,pdbogen/docs,tcolgate/docs,Cepave/openfalcon.io,Cepave/openfalcon.io,chosenken/docs,open-falcon/open-falcon.github.io,open-falcon/open-falcon.github.io,Cepave/openfalcon.io,prometheus/docs,chosenken/docs,ddfreyne/prometheus-docs,prometheus/docs,chosenken/docs,ddfreyne/prometheus-docs,tcolgate/docs,du2016/prometheus-docs,tcolgate/docs,du2016/prometheus-docs,pdbogen/docs,prometheus/docs,ddfreyne/prometheus-docs