Fix getValue for boolean types

[un0btanium]

I ran into an issue when trying to request the value of a stackframe variable when it was the boolean type.

(node:11980) UnhandledPromiseRejectionWarning: TypeError: this._bytes.getByte is not a function
    at ByteBuffer.getValue (D:\Studium\Masterarbeit\projects\jdwp-react\backend\node_modules\jdwp\lib\byte_buffer.js:332:29)
    at GetValues.decode (D:\Studium\Masterarbeit\projects\jdwp-react\backend\node_modules\jdwp\lib\command\stack_frame\get_values.js:38:24)
    at JDWPConnection._handlePacket (D:\Studium\Masterarbeit\projects\jdwp-react\backend\node_modules\jdwp\lib\connection.js:100:40)

Taking a look at the code it seemed it was trying to call the .getByte() function of Buffer which does not exist. It seems it was supposed to call the this.getByte() function instead.

      case 90: // BOOLEAN
        len = 1;
        value = this._bytes.getByte(index + 1) === 1;
        break;

PS: Good job on this library overall!

[codecov[bot]]

Codecov Report

Merging #2 (523cb27) into master (3ba67e8) will increase coverage by 3.04%. The diff coverage is 28.57%.

:exclamation: Current head 523cb27 differs from pull request most recent head ae689e0. Consider uploading reports for the commit ae689e0 to get more accurate results

@@            Coverage Diff             @@
##           master       #2      +/-   ##
==========================================
+ Coverage   60.18%   63.22%   +3.04%     
==========================================
  Files         178      178              
  Lines        3870     3872       +2     
==========================================
+ Hits         2329     2448     +119     
+ Misses       1541     1424     -117     

Impacted Files	Coverage Δ
lib/byte_buffer.js	58.14% <0.00%> (+0.22%)	:arrow_up:
lib/command/virtual_machine/all_threads.js	25.00% <0.00%> (ø)
lib/value/array_reference.js	21.42% <ø> (-48.58%)	:arrow_down:
lib/virtual_machine.js	59.92% <0.00%> (+2.24%)	:arrow_up:
lib/event_request_manager.js	80.00% <50.00%> (-12.86%)	:arrow_down:
lib/command/const/tag.js	100.00% <100.00%> (ø)
lib/event/modifier/count.js	16.66% <0.00%> (-83.34%)	:arrow_down:
lib/event/modifier/step.js	18.18% <0.00%> (-81.82%)	:arrow_down:
lib/command/array_reference/set_values.js	23.07% <0.00%> (-76.93%)	:arrow_down:
lib/command/thread_group_reference/children.js	22.22% <0.00%> (-72.23%)	:arrow_down:
... and 46 more

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[un0btanium]

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