Fallthrough RPC provider

[dawsbot]

Closes #22

• Timeout (if the URL takes 10+ seconds)
• Consider singletons (a shared memory for current index will be critical to success)
• Consider a mutex or lock on the add such that adding to the rpc counter can happen max once per 10 seconds (give or take)

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[codecov]

Codecov Report

Merging #90 (58a7c49) into master (2655153) will increase coverage by 0.27%.
The diff coverage is 94.50%.

❗ Current head 58a7c49 differs from pull request most recent head 4bfeb5a. Consider uploading reports for the commit 4bfeb5a to get more accurate results

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
+ Coverage   90.51%   90.79%   +0.27%     
==========================================
  Files          28       30       +2     
  Lines         675      717      +42     
  Branches      196      202       +6     
==========================================
+ Hits          611      651      +40     
- Misses         59       61       +2     
  Partials        5        5              

Impacted Files	Coverage Δ
src/classes/Contract.ts	100.00% <ø> (ø)
src/utils/solidity-keccak256.ts	87.83% <50.00%> (ø)
src/providers/FallthroughProvider.ts	90.00% <90.00%> (ø)
src/providers/BaseProvider.ts	97.87% <97.87%> (ø)
src/classes/utils/encode-decode-transaction.ts	93.75% <100.00%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/providers/JsonRpcProvider.ts	100.00% <100.00%> (+4.25%)	⬆️

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