FIx PHP-Style and travis

[DeepDiver1975]

• [x] apply pretty ci style fixes
• [x] get travis green

[codecov[bot]]

Codecov Report

Merging #167 into 2.1 will increase coverage by <.01%. The diff coverage is 99.13%.

@@             Coverage Diff              @@
##                2.1     #167      +/-   ##
============================================
+ Coverage     97.48%   97.49%   +<.01%     
  Complexity      112      112              
============================================
  Files            13       13              
  Lines           438      439       +1     
============================================
+ Hits            427      428       +1     
  Misses           11       11

Impacted Files	Coverage Δ	Complexity Δ
lib/Writer.php	100% <100%> (ø)	19 <19> (ø)	:arrow_down:
lib/Serializer/functions.php	100% <100%> (ø)	0 <0> (ø)	:arrow_down:
lib/ContextStackTrait.php	100% <100%> (ø)	2 <2> (ø)	:arrow_down:
lib/Service.php	100% <100%> (ø)	18 <18> (ø)	:arrow_down:
lib/Element/Cdata.php	100% <100%> (ø)	2 <2> (ø)	:arrow_down:
lib/LibXMLException.php	100% <100%> (ø)	2 <2> (ø)	:arrow_down:
lib/Reader.php	99.11% <100%> (ø)	43 <43> (ø)	:arrow_down:
lib/Element/Uri.php	100% <100%> (ø)	3 <3> (ø)	:arrow_down:
lib/Element/XmlFragment.php	100% <100%> (ø)	14 <14> (ø)	:arrow_down:
lib/Element/Elements.php	100% <100%> (ø)	3 <3> (ø)	:arrow_down:
... and 3 more

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[staabm]

Lgtm