Read me fix

[JulianKast]

Fixes #1669

This PR is {ready] for review.

Risk

This PR makes [no] API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).
• I have tested Android, Java SE, and Java EE

Summary

ReadME updates for hotfix 5.1.1

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #1668 (8137039) into release/5.1.1_RC (9eef69d) will not change coverage.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##             release/5.1.1_RC    #1668   +/-   ##
===================================================
  Coverage               53.94%   53.94%           
- Complexity               5304     5307    +3     
===================================================
  Files                     555      555           
  Lines                   24561    24561           
  Branches                 3101     3101           
===================================================
  Hits                    13250    13250           
  Misses                  10160    10160           
  Partials                 1151     1151           

Impacted Files	Coverage Δ	Complexity Δ
...agers/screen/menu/VoiceCommandUpdateOperation.java	76.85% <0.00%> (-1.86%)	16.00% <0.00%> (-1.00%)
...rtdevicelink/streaming/video/SdlRemoteDisplay.java	50.00% <0.00%> (-1.22%)	5.00% <0.00%> (ø%)
...ink/managers/screen/BaseTextAndGraphicManager.java	64.16% <0.00%> (+0.41%)	52.00% <0.00%> (+2.00%)
...nk/managers/audio/AudioDecoderCompatOperation.java	79.54% <0.00%> (+4.54%)	10.00% <0.00%> (+1.00%)

[RHenigan]

Now that 5.0 is on mavenCentral I think we should update the dependency lines to use 5.+ instead of a specific version and I think the badges should still read Download Android, or Downlaod JavaSE, etc. instead of Maven Central