Update README.md

Author: toml01

README.md

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 # SNIP-20 Reference Implementation
 
-This is an implementation of a [SNIP-20](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-20.md), [SNIP-21](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-21.md), [SNIP-22](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-22.md), [SNIP-23](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-23.md) and [SNIP-24](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-24.md) compliant token contract.
+This is an implementation of a [SNIP-20](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-20.md), [SNIP-21](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-21.md), [SNIP-22](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-22.md), [SNIP-23](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-23.md), [SNIP-24](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-24.md), [SNIP-25](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-25.md) and [SNIP-26](https://github.com/SecretFoundation/SNIPs/blob/master/SNIP-26.md) compliant token contract.
 
 > **Note:**
 > The master branch contains new features not covered by officially-released SNIPs and may be subject to change. When releasing a token on mainnet, we recommend you start with a [tagged release](https://github.com/scrtlabs/snip20-reference-impl/tags) to ensure compatibility with SNIP standards.