Remove unsupported node versions, update readme

Author: andrcuns

.travis.yml

@@ -1,12 +1,12 @@
 language: node_js
 node_js:
-  - "6"
-  - "7"
   - "8"
-  - "9"
+  - "10"
+  - "12"
 env:
   - JEST_VERSION=^22.0.0
   - JEST_VERSION=^23.0.0
   - JEST_VERSION=^24.0.0
+  - JEST_VERSION=^24.9.0
 script:
   - npm run test:ci

README.md

@@ -59,7 +59,7 @@ Reporter options should also be strings exception for suiteNameTemplate, classNa
 |--|--|--|--|--|
 | `JEST_SUITE_NAME` | `suiteName` | `name` attribute of `<testsuites>` | `"jest tests"` | N/A
 | `JEST_JUNIT_OUTPUT_DIR` | `outputDirectory` | Directory to save the output. | `process.cwd()` | N/A
-| `JEST_JUNIT_OUTPUT_NAME` | `outputName` | File name for the output. | `"junit.xml"` | N/A
+| `JEST_JUNIT_OUTPUT_NAME` | `outputName` | File name for the output. | `"junit-${uuid}.xml"` | N/A
 | `JEST_JUNIT_SUITE_NAME` | `suiteNameTemplate` | Template string for `name` attribute of the `<testsuite>`. | `"{title}"` | `{title}`, `{filepath}`, `{filename}`, `{displayName}`
 | `JEST_JUNIT_CLASSNAME` | `classNameTemplate` | Template string for the `classname` attribute of `<testcase>`. | `"{classname} {title}"` | `{classname}`, `{title}`, `{filepath}`, `{filename}`, `{displayName}`
 | `JEST_JUNIT_TITLE` | `titleTemplate` | Template string for the `name` attribute of `<testcase>`. | `"{classname} {title}"` | `{classname}`, `{title}`, `{filepath}`, `{filename}`, `{displayName}`