extractTags方法选项设置allowPOS后可能异常

[bedlate]

未预先设置$words变量，导致程序异常。

foreach ($wordsPos as $key => $word) {
    if (in_array($word['tag'], $options['allowPOS'])) {
        $words[] = $word['word'];
    }
}

[codecov-io]

Codecov Report

Merging #66 into master will decrease coverage by 0.04%. The diff coverage is 50%.

@@             Coverage Diff              @@
##             master      #66      +/-   ##
============================================
- Coverage     55.47%   55.42%   -0.05%     
- Complexity      268      270       +2     
============================================
  Files             5        5              
  Lines          1141     1142       +1     
============================================
  Hits            633      633              
- Misses          508      509       +1

Impacted Files	Coverage Δ	Complexity Δ
src/class/JiebaAnalyse.php	75.8% <50%> (-1.25%)	19 <0> (+2)

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[fukuball]

感謝！