remove 1.x links from readme

Author: oshai

README.md

@@ -61,36 +61,16 @@ In short, if you just want to log statements to stdout, it's possible to add the
   <version>2.1.20</version>
 </dependency>
 ```
-or
-```xml
-<dependency>
-  <groupId>io.github.microutils</groupId>
-  <artifactId>kotlin-logging</artifactId>
-  <version>1.12.5</version>
-</dependency>
-```
 See the full example in [kotlin-logging-example-maven](https://github.com/MicroUtils/kotlin-logging-example-maven).  
 
 ### Gradle
 ```Groovy
 implementation 'io.github.microutils:kotlin-logging-jvm:2.1.20'
 ```
-or
-```Groovy
-implementation 'io.github.microutils:kotlin-logging:1.12.5'
-```
 
 Alternatively, download the JAR from [github](https://github.com/MicroUtils/kotlin-logging/releases/latest) or [bintray](https://dl.bintray.com/microutils/kotlin-logging/io/github/microutils/kotlin-logging/) or [maven-central](http://repo1.maven.org/maven2/io/github/microutils/kotlin-logging/).
 
-### Version 2.x vs 1.x
-
-**There are currently two supported branches: 1.x and 2.x.**  
-
-The main incompatible change is in the artifact names. In version `1.x` the jvm artifact is called `kotlin-logging` while in version `2.x` it's called `kotlin-logging-jvm` to comply with the multiplatform schema. In addition, version 2.x supports only Kotlin >= 1.4.
-
-Therefore, for jvm library owners it is still recommended to use 1.x, as for the rest of the use cases 2.x is recommended.
-
-#### Multiplatform
+### Multiplatform
 
 An experimental common & JS & linux-x64 support is available.  
 More information is available on the [wiki](https://github.com/MicroUtils/kotlin-logging/wiki/Multiplatform-support) and issues [#21](https://github.com/MicroUtils/kotlin-logging/issues/21) [#45](https://github.com/MicroUtils/kotlin-logging/issues/45).