update README.md.

Signed-off-by: 山东大学-刘明宏 <liuminghong@mail.sdu.edu.cn>

README.md

@@ -15,7 +15,9 @@
 
 1.  Installing MATLAB 
 2.  Installing COMSOL
-The authors recommend installing the latest version of the software.
+ The authors recommend installing the latest version of the software.
+
+
 
 #### 运行说明 Run Instructions
 
@@ -29,3 +31,4 @@ The authors recommend installing the latest version of the software.
 #### 如何引用 How to Cite
 
  The paper was submitted to Computers & Geosciences under the title "efficient geophysical modeling techniques for complex real geological structures".
+### 标题