Address PR comments.

Author: marc0der

src/main/bash/sdkman-selfupdate.sh

@@ -37,8 +37,8 @@ function __sdk_selfupdate() {
 	sdkman_remote_script_version=$(__sdkman_secure_curl "$sdkman_script_version_api")
 	sdkman_remote_native_version=$(__sdkman_secure_curl "$sdkman_native_version_api")
 
-	sdkman_local_script_version=$(cat "$SDKMAN_DIR/var/version")
-	sdkman_local_native_version=$(cat "$SDKMAN_DIR/var/version_native")
+	sdkman_local_script_version=$(< "$SDKMAN_DIR/var/version")
+	sdkman_local_native_version=$(< "$SDKMAN_DIR/var/version_native")
 
 	__sdkman_echo_debug "Script: local version: $sdkman_local_script_version; remote version: $sdkman_remote_script_version"
 	__sdkman_echo_debug "Native: local version: $sdkman_local_native_version; remote version: $sdkman_remote_native_version"