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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