Update Gradle to 6.7.1

Use kts build script
Update dependencies

build.gradle.kts

@@ -0,0 +1,61 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    val kotlinVersion = "1.4.10"
+
+    kotlin("jvm") version kotlinVersion
+    kotlin("plugin.serialization") version kotlinVersion
+
+    id("org.jetbrains.kotlin.kapt") version kotlinVersion
+}
+
+group = "de.wulkanat"
+version = "2.0.0"
+
+repositories {
+    mavenCentral()
+    jcenter()
+    maven("https://kotlin.bintray.com/koltinx")
+    maven("https://dl.bintray.com/kordlib/Kord")
+}
+
+dependencies {
+    testImplementation(kotlin("test-junit"))
+
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+
+    implementation("org.jsoup:jsoup:1.13.1")
+
+    implementation("dev.kord:kord-common:0.7.0-RC")
+    implementation("com.gitlab.kordlib.kordx:kordx-commands-runtime-kord:0.3.4")
+    implementation("com.gitlab.kordlib:kordx.emoji:0.4.0")
+
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.0.1")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.2")
+
+    kapt("com.gitlab.kordlib.kordx:kordx-commands-processor:0.3.4")
+}
+
+tasks.test {
+    useJUnit()
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions.jvmTarget = "1.8"
+}
+
+tasks.withType<Jar> {
+    manifest {
+        attributes(mapOf(Pair("Main-Class", "de.wulkanat.MainKt")))
+    }
+}
+
+tasks.create<Jar>("fatJar") {
+    archiveBaseName.set("${project.name}-all")
+    manifest {
+        attributes["Implementation-Version"] = archiveVersion
+        attributes["Main-Class"] = "de.wulkanat.MainKt"
+    }
+    from(configurations.runtimeClasspath.get().map { if (it.isDirectory) it else zipTree(it) })
+    with(tasks.jar.get() as CopySpec)
+}