Add ethereum.org blog post about petersburg (#1794)

ethereum · Mar 8, 2019 · 31dafbe · 31dafbe
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diff --git a/EIPS/eip-1716.md b/EIPS/eip-1716.md
@@ -31,7 +31,8 @@ If `Petersburg` is defined with an earlier block number than `Constantinople`, t
 
 ## References
 
-The list above includes the EIPs that had to be removed from Constantinople due to a [potential reentrancy attack vector](https://medium.com/chainsecurity/constantinople-enables-new-reentrancy-attack-ace4088297d9). Removing this was agreed upon at the [All-Core-Devs call #53 in January 2019](https://github.com/ethereum/pm/issues/70).
+1. The list above includes the EIPs that had to be removed from Constantinople due to a [potential reentrancy attack vector](https://medium.com/chainsecurity/constantinople-enables-new-reentrancy-attack-ace4088297d9). Removing this was agreed upon at the [All-Core-Devs call #53 in January 2019](https://github.com/ethereum/pm/issues/70).
+2. https://blog.ethereum.org/2019/02/22/ethereum-constantinople-st-petersburg-upgrade-announcement/
 
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