Drop support for extension-lib 1.3

app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt

@@ -38,7 +38,7 @@ internal object ExtensionLoader {
     private const val METADATA_NSFW = "tachiyomi.extension.nsfw"
     private const val METADATA_HAS_README = "tachiyomi.extension.hasReadme"
     private const val METADATA_HAS_CHANGELOG = "tachiyomi.extension.hasChangelog"
-    const val LIB_VERSION_MIN = 1.3
+    const val LIB_VERSION_MIN = 1.4
     const val LIB_VERSION_MAX = 1.5
 
     private val PACKAGE_FLAGS = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {