Update package dependencies to support php 7.4

[zrashwani]

• Major dependencies update to support php 7.4
• Replace illuminate/support package with tightenco/collect to provide collections with minimal dependency
• Amending unit tests and Travis settings to prevent chromedriver version error

[codecov-commenter]

Codecov Report

Merging #35 into master will decrease coverage by 1.20%.
The diff coverage is 95.83%.

@@             Coverage Diff              @@
##             master      #35      +/-   ##
============================================
- Coverage     96.24%   95.04%   -1.21%     
+ Complexity      140      118      -22     
============================================
  Files             6        6              
  Lines           373      343      -30     
============================================
- Hits            359      326      -33     
- Misses           14       17       +3     

Impacted Files	Coverage Δ	Complexity Δ
src/Arachnid/Crawler.php	92.13% <93.85%> (-1.24%)	51.00 <36.00> (-10.00)
src/Arachnid/Link.php	96.93% <97.91%> (-1.40%)	48.00 <34.00> (-6.00)
src/Arachnid/Adapters/CrawlingFactory.php	100.00% <100.00%> (ø)	5.00 <5.00> (+2.00)
src/Arachnid/Adapters/GoutteAdapter.php	100.00% <100.00%> (ø)	3.00 <3.00> (-1.00)
src/Arachnid/Adapters/PantherChromeAdapter.php	100.00% <100.00%> (ø)	3.00 <3.00> (ø)
src/Arachnid/LinksCollection.php	100.00% <100.00%> (ø)	8.00 <8.00> (-7.00)

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