fix: return type of XmlFragment::xmlDeserialize to match base declara…

[DeepDiver1975]

…tion

XmlDeserializable::xmlDeserialize has no return type defined as well and any sub-class of XmlFragment will also return mixed - see various xml classes in sabre/dav

refs

xml/lib/XmlDeserializable.php

Line 37 in 4689ae1

public static function xmlDeserialize(Reader $reader);

[codecov]

Codecov Report

Merging #258 (f273a8c) into master (a0de970) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #258   +/-   ##
=========================================
  Coverage     96.75%   96.75%           
  Complexity      115      115           
=========================================
  Files            13       13           
  Lines           493      493           
=========================================
  Hits            477      477           
  Misses           16       16           

Files	Coverage Δ
lib/Element/XmlFragment.php	100.00% <100.00%> (ø)

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