Rename package resource to resources.

[songy23]

Fixes #259.

[codecov-io]

Codecov Report

Merging #366 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #366   +/-   ##
=========================================
  Coverage     63.95%   63.95%           
  Complexity      338      338           
=========================================
  Files            57       57           
  Lines          1293     1293           
  Branches        118      118           
=========================================
  Hits            827      827           
  Misses          423      423           
  Partials         43       43

Impacted Files	Coverage Δ	Complexity Δ
...main/java/io/opentelemetry/resources/Resource.java	85.71% <ø> (ø)	10 <0> (?)
...in/java/io/opentelemetry/metrics/DefaultMeter.java	54.02% <ø> (ø)	12 <0> (ø)	⬇️
...ain/java/io/opentelemetry/trace/DefaultTracer.java	68.29% <ø> (ø)	6 <0> (ø)	⬇️
...ain/java/io/opentelemetry/sdk/trace/TracerSdk.java	40% <ø> (ø)	5 <0> (ø)	⬇️
...src/main/java/io/opentelemetry/trace/SpanData.java	13.79% <ø> (ø)	0 <0> (ø)	⬇️
...io/opentelemetry/sdk/resources/EnvVarResource.java	0% <ø> (ø)	0 <0> (?)

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[bogdandrutu]

Fix the build?

[songy23]

Build fixed, PTAL.