Remove android API level validation

[jkwatson]

resolves #744

[codecov-io]

Codecov Report

Merging #822 into master will decrease coverage by 0.14%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #822      +/-   ##
============================================
- Coverage     79.22%   79.08%   -0.15%     
+ Complexity      790      789       -1     
============================================
  Files           104      104              
  Lines          2811     2811              
  Branches        269      269              
============================================
- Hits           2227     2223       -4     
- Misses          481      484       +3     
- Partials        103      104       +1

Impacted Files	Coverage Δ	Complexity Δ
...elemetry/sdk/trace/export/BatchSpansProcessor.java	89.65% <0%> (-1.73%)	7% <0%> (ø)
...ntelemetry/sdk/trace/RecordEventsReadableSpan.java	90.3% <0%> (-1.22%)	44% <0%> (-1%)

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[carlosalberto]

Looks great! Wondering why the update in the proto files though.

[jkwatson]

oh, good call on the protos. I'll revert that bit. It snuck in with my global search and replace.

[jkwatson]

I'm going to close this and open up another one. I really don't know how to git submodule properly.