Remove quotation marks from central search URL (#431)

Author: fzhinkin

README.md

@@ -3,7 +3,7 @@
 [![Kotlin Alpha](https://kotl.in/badges/alpha.svg)](https://kotlinlang.org/docs/components-stability.html)
 [![JetBrains official project](https://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub) 
 [![GitHub license](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg?style=flat)](http://www.apache.org/licenses/LICENSE-2.0)
-[![Maven Central](https://img.shields.io/maven-central/v/org.jetbrains.kotlinx/kotlinx-datetime.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:%22org.jetbrains.kotlinx%22%20AND%20a:%22kotlinx-datetime%22)
+[![Maven Central](https://img.shields.io/maven-central/v/org.jetbrains.kotlinx/kotlinx-datetime.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:org.jetbrains.kotlinx%20AND%20a:kotlinx-datetime)
 [![Kotlin](https://img.shields.io/badge/kotlin-1.9.21-blue.svg?logo=kotlin)](http://kotlinlang.org)
 [![KDoc link](https://img.shields.io/badge/API_reference-KDoc-blue)](https://kotlinlang.org/api/kotlinx-datetime/)
 [![Slack channel](https://img.shields.io/badge/chat-slack-blue.svg?logo=slack)](https://kotlinlang.slack.com/messages/kotlinx-datetime/)