Switch download and permissions paragraphs (#16)

Author: angristan

README.md

@@ -121,11 +121,6 @@ apt-get install libdbd-pg-perl
 yum install perl-DBD-Pg
 ```
 
-Add permissions :
-```
-chmod +x postgresqltuner.pl
-```
-
 Download :
 
 ```
@@ -135,6 +130,11 @@ curl -o postgresqltuner.pl postgresqltuner.pl
 curl -o postgresqltuner.pl https://postgresqltuner.pl
 ```
 
+Add permissions :
+```
+chmod +x postgresqltuner.pl
+```
+
 And run script :
 - Via network :
 ```