Change type of URL field to URI

[ta7uw]

Resolves #306
Related PR #360

Some fields to represent URL remains in using String type.
Replaces String with URI.

[codecov-io]

Codecov Report

Merging #491 into master will decrease coverage by 0.18%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #491      +/-   ##
============================================
- Coverage     71.78%   71.59%   -0.19%     
- Complexity      319      327       +8     
============================================
  Files           180      182       +2     
  Lines          1786     1841      +55     
  Branches         66       71       +5     
============================================
+ Hits           1282     1318      +36     
- Misses          462      478      +16     
- Partials         42       45       +3

Impacted Files	Coverage Δ	Complexity Δ
...inecorp/bot/model/message/flex/component/Icon.java	48.38% <ø> (ø)	1 <0> (ø)	⬇️
.../request/CreateClickBasedAudienceGroupRequest.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...om/linecorp/bot/client/LineOAuthClientBuilder.java	83.33% <0%> (-2.04%)	7% <0%> (ø)
...m/linecorp/bot/client/LineMessagingClientImpl.java	82.14% <0%> (-0.84%)	37% <0%> (-9%)
.../model/message/imagemap/MessageImagemapAction.java	100% <0%> (ø)	1% <0%> (ø)	⬇️
.../bot/model/message/imagemap/URIImagemapAction.java	100% <0%> (ø)	1% <0%> (ø)	⬇️
...a/com/linecorp/bot/client/LineMessagingClient.java	100% <0%> (ø)	2% <0%> (ø)	⬇️
...corp/bot/servlet/LineBotCallbackRequestParser.java	91.66% <0%> (ø)	4% <0%> (ø)	⬇️
...corp/bot/spring/boot/LineBotAutoConfiguration.java	100% <0%> (ø)	6% <0%> (+1%)	⬆️
...om/linecorp/bot/client/LineSignatureValidator.java
... and 4 more

[kazuki-ma]

Thank you. Changes looks good.
And I think we can change it with release note (without deprecation step).

[kazuki-ma]

p.s. We are planning next major release. This change may be skips in next minor and released as a part of next major.