chore(docs): fix typos on README

[ltsuda]

This commit fix some typos on the README file

Checklist

• [x] npm run dist all pass on my machine
  • all test passed, but one error not doc related was found

Test Suites: 7 passed, 7 total
Tests:       22 skipped, 18 passed, 40 total
Snapshots:   0 total
Time:        4.257 s
Ran all test suites.

> jest-pact@0.10.2 build
> rimraf dist && tsc --project tsconfig.dist.json

node_modules/@pact-foundation/pact-core/src/types.d.ts:1:8 - error TS1259: Module '"/home/ltsuda/developer/jest-pact/node_modules/@types/needle/index"' can only be default-imported using the 'esModuleInterop' flag

1 import needle from 'needle';
         ~~~~~~

  node_modules/@types/needle/index.d.ts:353:1
    353 export = needle;
        ~~~~~~~~~~~~~~~~
    This module is declared with using 'export =', and can only be used with a default import when using the 'esModuleInterop' flag.

Found 1 error in node_modules/@pact-foundation/pact-core/src/types.d.ts:1

• [x] I have followed the commit message guidelines, with messages suitable for appearing in the changelog

Description

[TimothyJones]

Some of these aren't typos; this project is in British English as the maintainers are based in Australia.

[mefellows]

Thanks!