Fix setup instructions

Add missing ">> ~/.psqlrc"

Author: NikolayS

README.md

@@ -41,7 +41,7 @@ The installation is trivial. Clone the repository and put "dba" alias to your `.
 ```bash
 git clone https://github.com/NikolayS/postgres_dba.git
 cd postgres_dba
-printf "%s %s %s %s\n" \\echo 🧐 🐘 'postgres_dba 6.0 installed. Use ":dba" to see menu'
+printf "%s %s %s %s\n" \\echo 🧐 🐘 'postgres_dba 6.0 installed. Use ":dba" to see menu' >> ~/.psqlrc
 printf "%s %s %s %s\n" \\set dba \'\\\\i $(pwd)/start.psql\' >> ~/.psqlrc
 ```