shorten mainnet description

README.md

@@ -475,7 +475,7 @@ There are various groups developing software stacks & apps for the broader ecosy
 
 ### Language Agnostic
 
--  🔵 [mainnet](https://mainnet.cash/) [[tutorial]](https://mainnet.cash/tutorial/) [[rest spec]](https://rest-unstable.mainnet.cash/api-docs/#/) - Typescript library, also available via rest api, or over rest from [python](https://github.com/mainnet-cash/mainnet-python-generated), [golang](https://github.com/mainnet-cash/mainnet-go-generated), [php](https://github.com/mainnet-cash/mainnet-php-generated) generated clients, [et. al](https://mainnet.cash/tutorial/other-languages.html)
+-  🔵 [mainnet](https://mainnet.cash/) [[tutorial]](https://mainnet.cash/tutorial/) [[rest spec]](https://rest-unstable.mainnet.cash/api-docs/#/) - Typescript library, also available via rest api, or [python](https://github.com/mainnet-cash/mainnet-python-generated), [golang](https://github.com/mainnet-cash/mainnet-go-generated), [php](https://github.com/mainnet-cash/mainnet-php-generated) clients, [et. al](https://mainnet.cash/tutorial/other-languages.html)
 - [Insomnia](https://insomnia.fountainhead.cash/) [[code]](https://github.com/fountainhead-cash/insomnia) - Swagger/OpenAPI3 specification for ElectrumX
 - [BitBox OpenAPI 3 (Swagger) spec](https://github.com/Bitcoin-com/rest.bitcoin.com/tree/master/swaggerJSONFiles) - for rest.bitcoin.com see: [openapi-generator](https://github.com/OpenAPITools/openapi-generator)