Added build prop save after build prop get

            // - builds/CURRENT_ZIP_FILE.zip.prop ( which must exist )

            $this->buildProp = explode( "\n", @file_get_contents($this->getPropFilePath()));

            // Try to fetch build.prop values. In some cases, we can provide a fallback, in other a null value will be given

            if(!file_exists($this->filePath.'.prop')) {

                file_put_contents($this->filePath . '.prop', implode("\n", $this->buildProp));

            }

            $this->timestamp = intval( $this->getBuildPropValue( 'ro.build.date.utc' ) ?? filemtime($this->filePath) );

            $this->incremental = $this->getBuildPropValue( 'ro.build.version.incremental' ) ?? '';

            $this->apiLevel = $this->getBuildPropValue( 'ro.build.version.sdk' ) ?? '';