Update m_bubbles.fpp

Author: sbryngelson

src/simulation/m_bubbles.fpp

@@ -7,7 +7,7 @@
 !> @brief This module contains the procedures shared by the ensemble-averaged and volume-averaged bubble models.
 module m_bubbles
 
-    use m_derived_types        !< Definitions of the derived types
+    use m_derived_types        !< Definitions of the derived types 
 
     use m_global_parameters    !< Definitions of the global parameters