Bump versions in readme examples

Author: rustprooflabs

README.md

@@ -54,9 +54,9 @@ Binaries are available for Ubuntu 20.04 (bionic) and Ubuntu 21.04 (hirsute).
 Download and install.
 
 ```bash
-wget https://github.com/rustprooflabs/pgdd/releases/download/0.4.0.rc2/pgdd_0.4.0.rc2_focal_pg13_amd64.deb
+wget https://github.com/rustprooflabs/pgdd/releases/download/0.4.0.rc3/pgdd_0.4.0.rc3_focal_pg13_amd64.deb
 
-sudo dpkg -i ./pgdd_0.4.0.rc2_focal_pg13_amd64.deb
+sudo dpkg -i ./pgdd_0.4.0.rc3_focal_pg13_amd64.deb
 ```
 
 In your database.
@@ -79,7 +79,7 @@ SELECT extname, extversion
 ┌─────────┬────────────┐
 │ extname │ extversion │
 ╞═════════╪════════════╡
-│ pgdd    │ 0.4.0.rc2  │
+│ pgdd    │ 0.4.0.rc3  │
 └─────────┴────────────┘
 ```