Fix HTTP save state transaction.

[artursouza]

Description

Fix HTTP save state transaction.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #514

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

Merging #516 (788eea6) into master (9c5084b) will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #516      +/-   ##
============================================
+ Coverage     80.43%   80.59%   +0.16%     
- Complexity      974      975       +1     
============================================
  Files            88       88              
  Lines          3015     3015              
  Branches        330      330              
============================================
+ Hits           2425     2430       +5     
+ Misses          424      420       -4     
+ Partials        166      165       -1     

Impacted Files	Coverage Δ	Complexity Δ
...k/src/main/java/io/dapr/client/DaprClientHttp.java	91.78% <100.00%> (+1.71%)	96.00 <0.00> (+1.00)

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[beiwei30]

LGTM