Update FeedTime validation Regex pattern

[koonweee]

Resolve #248
Resolve #260
Resolve #245
Resolve #240

[codecov]

Codecov Report

Merging #286 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #286   +/-   ##
=========================================
  Coverage     74.79%   74.79%           
  Complexity      544      544           
=========================================
  Files            83       83           
  Lines          1579     1579           
  Branches        158      158           
=========================================
  Hits           1181     1181           
  Misses          340      340           
  Partials         58       58           

Impacted Files	Coverage Δ	Complexity Δ
...in/java/seedu/zookeep/model/feedtime/FeedTime.java	84.61% <ø> (ø)	6.00 <0.00> (ø)

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[koonweee]

Resolves #240, #245 and #260 as well