Benchmarks

[AlekSi]

• [ ] https://github.com/go-reform/golang-sql-benchmark
• [ ] https://github.com/go-reform/boilbench
• [ ] https://github.com/go-reform/orm-benchmark
• [ ] something else?
• [ ] small own benchmarks in this repo
• [ ] mention in README

[AlekSi]

Note: I was pointed out that some reflection-based ORMs are 4 times slower then reform or plain database/sql. May as well add this to README.