docs: fix typo in the README.md (#456)

Author: JoshRobertson

README.md

@@ -147,7 +147,7 @@ Options passed to the plugin constructor will overwrite options from the cosmico
 | `eslint`          | `object`              | `undefined`                                      | If `undefined`, it disables ESLint linter. If an `object`, see [ESLint options](#eslint-options). |
 | `issue`           | `object`              | `{}`                                             | See [Issues options](#issues-options). |
 | `formatter`       | `string` or `object`  | `codeframe`                                      | Available formatters are `basic` and `codeframe`. To [configure](https://babeljs.io/docs/en/babel-code-frame#options) `codeframe` formatter, pass object: `{ type: 'codeframe', options: { <coderame options> } }`. |
-| `logger`          | `object`              | `{ infastructure: 'silent', issues: 'console' }` | Available loggers are `silent`, `console`, and `webpack-infrastructure`. Infrastructure logger prints additional information, issue logger prints `issues` in the `async` mode. |
+| `logger`          | `object`              | `{ infrastructure: 'silent', issues: 'console' }` | Available loggers are `silent`, `console`, and `webpack-infrastructure`. Infrastructure logger prints additional information, issue logger prints `issues` in the `async` mode. |
 
 ### TypeScript options
 
@@ -162,7 +162,7 @@ Options for the TypeScript checker (`typescript` option object).
 | `context`            | `string`  | `dirname(configuration.configFile)`                                                                            | The base path for finding files specified in the `tsconfig.json`. Same as the `context` option from the [ts-loader](https://github.com/TypeStrong/ts-loader#context). Useful if you want to keep your `tsconfig.json` in an external package. Keep in mind that **not** having a `tsconfig.json` in your project root can cause different behaviour between `fork-ts-checker-webpack-plugin` and `tsc`. When using editors like `VS Code` it is advised to add a `tsconfig.json` file to the root of the project and extend the config file referenced in option `configFile`.  |
 | `build`              | `boolean` | `false`                                                                                                        | The equivalent of the `--build` flag for the `tsc` command. |
 | `mode`               | `'readonly'` or `'write-tsbuildinfo'` or `'write-references'` | `'write-tsbuildinfo'`                                      | If you use the `babel-loader`, it's recommended to use `write-references` mode to improve initial compilation time. If you use `ts-loader`, it's recommended to use `write-tsbuildinfo` mode to not overwrite filed emitted by the `ts-loader`. |
-| `diagnosticsOptions` | `object`  | `{ syntactic: false, semantic: true, declaration: false, global: false }`                                      | Settings to select which diagnostics do we want to perform. |
+| `diagnosticOptions` | `object`  | `{ syntactic: false, semantic: true, declaration: false, global: false }`                                      | Settings to select which diagnostics do we want to perform. |
 | `extensions`         | `object`  | `{}`                                                                                                           | See [TypeScript extensions options](#typescript-extensions-options). |
 | `profile`            | `boolean` | `false`                                                                                                        | Measures and prints timings related to the TypeScript performance. |