:lady_beetle: Bug Fixes

• Can't download version 4.5.1 from maven central #217 - fixed by setting jar classifier to empty string :

Gradle :

dependencies {
    compile 'io.github.lognet:grpc-spring-boot-starter:4.5.2'
}

Maven :

<dependency>
    <groupId>io.github.lognet</groupId>
    <artifactId>grpc-spring-boot-starter</artifactId>
    <version>4.5.2</version>
</dependency>