Fix encoding problem when generating extent reports

[EvaSRGitHub]

When write the extent report In BufferedWriterWriter.java the ‘write’ method use the default system encoding instead of what the user is set in reporter.config().setEncodint() or to use the default encoding set to be “UTF-8” in FileReporterConfig.java.

[codecov]

Codecov Report

Merging #298 (69a5597) into master (6d004b2) will increase coverage by 0.01%.
The diff coverage is 80.00%.

@@             Coverage Diff              @@
##             master     #298      +/-   ##
============================================
+ Coverage     78.10%   78.12%   +0.01%     
  Complexity      493      493              
============================================
  Files            89       89              
  Lines          1544     1545       +1     
  Branches        128      128              
============================================
+ Hits           1206     1207       +1     
  Misses          269      269              
  Partials         69       69              

Impacted Files	Coverage Δ	Complexity Δ
...ntstack/extentreports/io/BufferedWriterWriter.java	77.77% <50.00%> (ø)	3.00 <1.00> (ø)
...k/extentreports/reporter/AbstractFileReporter.java	76.59% <100.00%> (+0.50%)	11.00 <0.00> (ø)
...ck/extentreports/reporter/ExtentSparkReporter.java	85.18% <100.00%> (ø)	13.00 <0.00> (ø)
...k/extentreports/templating/FreemarkerTemplate.java	85.71% <100.00%> (ø)	5.00 <0.00> (ø)

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