feat: update kotlin sdk to 0.12.x

Author: christyjacob4

README.md

@@ -39,7 +39,7 @@ repositories {
 Next, add the dependency to your project's `build.gradle(.kts)` file:
 
 ```groovy
-implementation("io.appwrite:sdk-for-kotlin:0.1.1")
+implementation("io.appwrite:sdk-for-kotlin:0.2.0-SNAPSHOT")
 ```
 
 ### Maven
@@ -50,7 +50,7 @@ Add this to your project's `pom.xml` file:
     <dependency>
         <groupId>io.appwrite</groupId>
         <artifactId>sdk-for-kotlin</artifactId>
-        <version>0.1.1</version>
+        <version>0.2.0-SNAPSHOT</version>
     </dependency>
 </dependencies>
 ```

build.gradle

@@ -6,7 +6,7 @@ plugins {
 ext {
     PUBLISH_GROUP_ID = 'io.appwrite'
     PUBLISH_ARTIFACT_ID = 'sdk-for-kotlin'
-    PUBLISH_VERSION = '0.1.1'
+    PUBLISH_VERSION = '0.2.0-SNAPSHOT'
     POM_URL = 'https://github.com/appwrite/sdk-for-kotlin'
     POM_SCM_URL = 'https://github.com/appwrite/sdk-for-kotlin'
     POM_ISSUE_URL = 'https://github.com/appwrite/sdk-for-kotlin/issues'

src/main/kotlin/io/appwrite/Client.kt

@@ -55,7 +55,7 @@ class Client @JvmOverloads constructor(
     init {
         headers = mutableMapOf(
             "content-type" to "application/json",
-            "x-sdk-version" to "appwrite:kotlin:0.1.1",            
+            "x-sdk-version" to "appwrite:kotlin:0.2.0-SNAPSHOT",            
             "x-appwrite-response-format" to "0.11.0"
         )
         config = mutableMapOf()