chore(docs): update version in docs to 0.3.0

Author: WipeAir

docs/codegen/gettings-started.md

@@ -7,7 +7,7 @@ It also creates the required sourceset for the generated code by itself.
 ```kotlin
 plugins {
   // Apply the plugin with the latest version.
-    id("com.auritylab.graphql-kotlin-toolkit.codegen") version "0.1.0"
+    id("com.auritylab.graphql-kotlin-toolkit.codegen") version "0.3.0"
 }
 
 // Configure the code generation.

docs/spring-boot-integration/getting-started.md

@@ -5,7 +5,7 @@ The Spring Boot starter configures most parts by it self. You just have to confi
 #### Gradle
 ```kotlin
 dependencies {
-    implementation("com.auritylab.graphql-kotlin-toolkit:spring-boot-starter:0.1.0")
+    implementation("com.auritylab.graphql-kotlin-toolkit:spring-boot-starter:0.3.0")
 }
 ```
 
@@ -14,7 +14,7 @@ dependencies {
 <dependency>
     <groupId>com.auritylab.graphql-kotlin-toolkit</groupId>
     <artifactId>spring-boot-starter</artifactId>
-    <version>0.1.0</version>
+    <version>0.3.0</version>
 </dependency>
 ```