chore: update README.md

README.md

@@ -232,7 +232,7 @@ Available targets:
 | <a name="input_badge_enabled"></a> [badge\_enabled](#input\_badge\_enabled) | Generates a publicly-accessible URL for the projects build badge. Available as badge\_url attribute when enabled | `bool` | `false` | no |
 | <a name="input_branch"></a> [branch](#input\_branch) | Branch of the GitHub repository, _e.g._ `master` | `string` | n/a | yes |
 | <a name="input_build_compute_type"></a> [build\_compute\_type](#input\_build\_compute\_type) | `CodeBuild` instance size. Possible values are: `BUILD_GENERAL1_SMALL` `BUILD_GENERAL1_MEDIUM` `BUILD_GENERAL1_LARGE` | `string` | `"BUILD_GENERAL1_SMALL"` | no |
-| <a name="input_build_image"></a> [build\_image](#input\_build\_image) | Docker image for build environment, _e.g._ `aws/codebuild/docker:docker:17.09.0` | `string` | `"aws/codebuild/docker:17.09.0"` | no |
+| <a name="input_build_image"></a> [build\_image](#input\_build\_image) | Docker image for build environment, https://docs.aws.amazon.com/codebuild/latest/userguide/build-env-ref-available.html | `string` | `"aws/codebuild/amazonlinux2-x86_64-standard:5.0"` | no |
 | <a name="input_build_timeout"></a> [build\_timeout](#input\_build\_timeout) | How long in minutes, from 5 to 480 (8 hours), for AWS CodeBuild to wait until timing out any related build that does not get marked as completed | `number` | `60` | no |
 | <a name="input_build_type"></a> [build\_type](#input\_build\_type) | The type of build environment, e.g. 'LINUX\_CONTAINER' or 'WINDOWS\_CONTAINER' or 'ARM\_CONTAINER' | `string` | `"LINUX_CONTAINER"` | no |
 | <a name="input_buildspec"></a> [buildspec](#input\_buildspec) | Declaration to use for building the project. [For more info](http://docs.aws.amazon.com/codebuild/latest/userguide/build-spec-ref.html) | `string` | `""` | no |