modules.md: travis-ci.org -> travis-ci.com migration

[dgrove-oss]

We missed changing the URL in modules.md when we migrated back in end of 2020.

[codecov-commenter]

Codecov Report

Merging #5139 (a0e5aea) into master (0cdfdb3) will increase coverage by 30.81%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #5139       +/-   ##
===========================================
+ Coverage   43.78%   74.59%   +30.81%     
===========================================
  Files         231      224        -7     
  Lines       12807    12543      -264     
  Branches      528      524        -4     
===========================================
+ Hits         5608     9357     +3749     
+ Misses       7199     3186     -4013     

Impacted Files	Coverage Δ
...nwhisk/core/monitoring/metrics/KamonRecorder.scala
.../core/monitoring/metrics/PrometheusEventsApi.scala
...k/core/monitoring/metrics/PrometheusRecorder.scala
...pache/openwhisk/core/monitoring/metrics/Main.scala
...hisk/core/monitoring/metrics/OpenWhiskEvents.scala
...penwhisk/core/monitoring/metrics/MetricNames.scala
...nwhisk/core/monitoring/metrics/EventConsumer.scala
...e/openwhisk/core/containerpool/ContainerPool.scala	96.86% <0.00%> (+1.56%)	⬆️
.../org/apache/openwhisk/core/entity/EntityPath.scala	100.00% <0.00%> (+1.88%)	⬆️
...la/org/apache/openwhisk/common/TransactionId.scala	94.38% <0.00%> (+2.24%)	⬆️
... and 130 more

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