fixed grpc.client properties in examples and doc

[uweschaefer]

From @StephanPraetsch on 2019-06-05 09:41:16 +0000 UTC

We investigated that only factcast has enable_keep_alive instead of enable-keep-alive

Therefor please update your documentation and examples.

See also

• starter has enable-keep-alive
• Google Search for grpc client "enable-keep-alive" results in about 211 results (https://www.google.com/search?client=firefox-b&ei=yIL3XJHTGIjFwQL8qIzYAg&q=grpc+client+%22enable-keep-alive%22&oq=grpc+client+%22enable-keep-alive%22&gs_l=psy-ab.3...9168.9725..9954...0.0..0.152.225.1j1......0....1..gws-wiz.i8yB0ke00QA)
• Google Search for grpc client "enable_keep_alive" results in exaclty 1 result; the FactCast Doc (https://www.google.com/search?client=firefox-b&ei=04L3XJraAc3ewAKRoZroAg&q=grpc+client+%22enable_keep_alive%22&oq=grpc+client+%22enable_keep_alive%22&gs_l=psy-ab.3...1445.3979..4207...0.0..0.256.454.3j0j1......0....1..gws-wiz.HpvoO7flUYQ)

Copied from original issue: Mercateo/factcast#446

[uweschaefer]

From @codecov[bot] on 2019-06-05 09:41:49 +0000 UTC

Codecov Report

Merging #446 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #446   +/-   ##
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  Coverage   88.98%   88.98%           
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  Files          78       78           
  Lines        1870     1870           
  Branches      169      169           
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  Hits         1664     1664           
  Misses        126      126           
  Partials       80       80