Throw exception when getting invalid timezone

[liurxliu]

No description provided.

[codecov-io]

Codecov Report

Merging #17 (22fd3b3) into master (f290360) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #17      +/-   ##
============================================
- Coverage     98.68%   98.67%   -0.02%     
- Complexity     1824     1837      +13     
============================================
  Files            67       67              
  Lines          4416     4453      +37     
============================================
+ Hits           4358     4394      +36     
- Misses           58       59       +1     

Impacted Files	Coverage Δ	Complexity Δ
lib/Property/ICalendar/DateTime.php	100.00% <100.00%> (ø)	44.00 <0.00> (ø)
lib/Property/Boolean.php	50.00% <0.00%> (-3.85%)	6.00% <0.00%> (ø%)
lib/Component/VCalendar.php	94.73% <0.00%> (-0.63%)	64.00% <0.00%> (ø%)
lib/UUIDUtil.php	100.00% <0.00%> (ø)	2.00% <0.00%> (ø%)
lib/Component/VCard.php	100.00% <0.00%> (ø)	55.00% <0.00%> (ø%)
lib/Property/UtcOffset.php	100.00% <0.00%> (ø)	3.00% <0.00%> (ø%)
lib/Property/ICalendar/Period.php	100.00% <0.00%> (ø)	9.00% <0.00%> (ø%)
lib/ITip/Broker.php	99.50% <0.00%> (+<0.01%)	155.00% <0.00%> (+1.00%)
lib/Parser/MimeDir.php	99.55% <0.00%> (+<0.01%)	85.00% <0.00%> (+1.00%)
... and 7 more

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