Add FORK NEXT forks and Sepolia Suggestion

[timbeiko]

Change Description

Adds the EIP-2124 FORK_NEXT upgrade section and suggests block 1735371 for Sepolia.
This block number was chosen to happen near slot 417120, which is expected on 8/17/2022 at 12:24:00 PM UTC.

Block Number Rationale

• Current slot: 223758
• Slots until 417120: 417120-223758 = 193362
• Blocks per slot: 0.949 (caused by 100/1973 Sepolia validator keys lost)
• Blocks until slot 417120: 193362*0.949 = 183500
• EL block number at slot 223758: 1551617
• Block height around slot 417120: 1551617+183500 = 1735117
• Closest palindrome: 1735371 🎉

Cute Animal Picture

[codecov-commenter]

Codecov Report

Merging #564 (1e45685) into master (b70bc37) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #564   +/-   ##
=======================================
  Coverage   77.82%   77.82%           
=======================================
  Files         333      333           
  Lines       19219    19219           
=======================================
  Hits        14958    14958           
  Misses       4261     4261           

Flag	Coverage Δ
unittests	77.82% <ø> (ø)

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[garyschulte]

🐕

PRs need more animal pictures. Taking this onboard.