update shields

README.md

@@ -1,16 +1,14 @@
 # Logback GELF
 
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+[![codecov](https://codecov.io/gh/osiegmar/logback-gelf/graph/badge.svg?token=YfDHBxprtb)](https://codecov.io/gh/osiegmar/logback-gelf)
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-[![Maven Central](https://img.shields.io/maven-central/v/de.siegmar/logback-gelf.svg)](https://search.maven.org/artifact/de.siegmar/logback-gelf)
-
+[![Maven Central](https://img.shields.io/maven-central/v/de.siegmar/logback-gelf.svg)](https://central.sonatype.com/artifact/de.siegmar/logback-gelf)
 
 Logback appender for sending GELF (Graylog Extended Log Format) messages with zero additional
 dependencies.
 
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 ## Features
 
 - UDP (with chunking)
@@ -23,13 +21,11 @@ dependencies.
 - Forwarding of exception root cause
 - No runtime dependencies beside Logback
 
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 ## Requirements
 
 - Java 11
 - Logback 1.4.11
 
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 ## Examples
 
 Simple UDP configuration:
@@ -97,7 +93,6 @@ Simple TCP with TLS configuration:
 
 Find more advanced examples in the [examples directory](examples).
 
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 ## Configuration
 
 ### Appender
@@ -115,7 +110,6 @@ Find more advanced examples in the [examples directory](examples).
 * **messageIdSupplier**: The mechanism that supplies unique message ids that are required by the
   GELF UDP protocol. Default: `de.siegmar.logbackgelf.MessageIdSupplier`.
 
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 `de.siegmar.logbackgelf.GelfTcpAppender`
 
 * **graylogHost**: IP or hostname of graylog server.
@@ -144,7 +138,6 @@ Find more advanced examples in the [examples directory](examples).
 * **insecure**: If true, skip the TLS certificate validation.
   You should not use this in production! Default: false.
 
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 ### Encoder
 
 `de.siegmar.logbackgelf.GelfEncoder`
@@ -177,7 +170,6 @@ Find more advanced examples in the [examples directory](examples).
 * **numbersAsString**: Log numbers as String. Default: false.
 * **staticFields**: Additional, static fields to send to graylog. Defaults: none.
 
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 ## Troubleshooting
 
 If you have any problems, enable the debug mode and check the logs.