add key for connections (#70)

README.md

@@ -78,6 +78,7 @@ If you want to add connections, you need to edit your config file. For more info
 | <kbd>H</kbd>, <kbd>J</kbd>, <kbd>K</kbd>, <kbd>L</kbd> | Extend selection by one cell left/down/up/right |
 | <kbd>y</kbd> | Copy a cell value |
 | <kbd>←</kbd>, <kbd>→</kbd> | Move focus to left/right |
+| <kbd>c</kbd> | Move focus to connections |
 | <kbd>/</kbd> | Filter |
 | <kbd>?</kbd> | Help |
 | <kbd>1</kbd>, <kbd>2</kbd>, <kbd>3</kbd>, <kbd>4</kbd>, <kbd>5</kbd> | Switch to records/columns/constraints/foreign keys/indexes tab |