Rust-style Option and Result Classes for PHP

chore(README.md): tick off Result::and and Result::andThen

Ciaran bb9bcd2d b6e22702

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README.md
··· 79 79 - [x] `unwrap()` 80 80 - [x] `unwrapOr()` 81 81 - Result 82 - - [ ] `and()` 83 - - [ ] `andThen()` 84 82 - [ ] `inspect()` 85 83 - [ ] `inspectErr()` 86 84 - [ ] `or()` 87 85 - [ ] `tryCatch()` 88 86 - [x] `Err()` 89 87 - [x] `Ok()` 88 + - [x] `and()` 89 + - [x] `andThen()` 90 90 - [x] `expect()` 91 91 - [x] `expectErr()` 92 92 - [x] `getErr()`