Add autocomplete for tags

[zhiayang]

Closes #145

[codecov-io]

Codecov Report

Merging #159 into master will increase coverage by 0.29%.
The diff coverage is 85.00%.

@@             Coverage Diff              @@
##             master     #159      +/-   ##
============================================
+ Coverage     47.08%   47.38%   +0.29%     
- Complexity      747      757      +10     
============================================
  Files           119      119              
  Lines          3020     3039      +19     
  Branches        417      419       +2     
============================================
+ Hits           1422     1440      +18     
  Misses         1435     1435              
- Partials        163      164       +1     

Impacted Files	Coverage Δ	Complexity Δ
...ava/chopchop/logic/autocomplete/AutoCompleter.java	86.48% <85.00%> (-0.22%)	85.00 <8.00> (+8.00)	⬇️
.../chopchop/logic/parser/commands/CommandTarget.java	85.71% <0.00%> (+14.28%)	10.00% <0.00%> (+1.00%)

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