Fix linting issues

README.md

@@ -11,17 +11,18 @@ Simplistic example: <https://github.com/JabRef/afterburner.fx/tree/main/demo-app
 
 See also: <http://afterburner.adam-bien.com>
 
-
 ## Release a new version to maven central
 
 Check gpg key and export:
+
 ```bash
 gpg --list-keys
 gpg -K --keyid-format short
 gpg --keyring secring.gpg --export-secret-keys > ~/.gnupg/secring.gpg
 ```
 
 fill out gradle.properties with
+
 ```
 signing.keyId=<last 8 digits of gpg key (short format) >
 signing.password=<gpg key passwrod>
@@ -33,7 +34,6 @@ ossrhPassword=<nexus ossrh password>
 
 When all is set: (Warning: This step cannot be undone!)
 
-```
+```terminal
 ./gradlew publishToSonatype closeAndReleaseSonatypeStagingRepository
 ```
-