Add fetchStock middleware to /eval

[ronnygunawan]

Supported syntax:

/eval $BBCA
/eval $TLKM.high

Available properties:

• name
• close
• previous
• high
• low
• volume
• value

[codecov]

Codecov Report

Merging #71 (78a93f9) into master (575662f) will decrease coverage by 1.40%.
The diff coverage is 91.89%.

@@             Coverage Diff             @@
##            master      #71      +/-   ##
===========================================
- Coverage   100.00%   98.59%   -1.41%     
===========================================
  Files            9       11       +2     
  Lines          532      642     +110     
===========================================
+ Hits           532      633     +101     
- Misses           0        9       +9     

Impacted Files	Coverage Δ
src/services/eval/superpowers.js	86.79% <86.79%> (ø)
src/services/eval/stock.js	96.29% <96.29%> (ø)
src/services/eval/parser.js	100.00% <100.00%> (ø)

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