add eip-160 preamble and references

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cdetrio 2017-07-17 11:02:44 -04:00 committed by Hudson Jameson
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EDITOR NOTE: below is a copy of the EIP 160 https://github.com/ethereum/EIPs/issues/160#issue-184230277 raw text fetched on 2017-07-17.
```
EIP: 160
Title: EXP cost increase
Author: Vitalik Buterin
Type: Standard Track
Category: Core
Status: Final
Created: 2016-10-20
```
### Specification
If `block.number >= FORK_BLKNUM`, increase the gas cost of EXP from 10 + 10 per byte in the exponent to 10 + 50 per byte in the exponent.
### Rationale
Benchmarks suggest that EXP is currently underpriced by a factor of about 4-8.
### References
1. EIP-160 issue and discussion: https://github.com/ethereum/EIPs/issues/160