Fix syntax error in example (#26)

OrangeTux · web-flow · commit a1f12b8df1d3 · 2021-06-25T13:34:40.000-04:00
One of the examples missed a trailing comma. The syntax error would result in
the error:

```
E5112: Error while creating lua chunk: init.lua:6: '}' expected (to close '{' at line 1) near 'enabled'
```
diff --git a/README.md b/README.md
@@ -66,7 +66,7 @@ require'lsp_extensions'.inlay_hints{
 	highlight = "Comment",
 	prefix = " > ",
 	aligned = false,
-	only_current_line = false
+	only_current_line = false,
 	enabled = { "ChainingHint" }
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -66,7 +66,7 @@ require'lsp_extensions'.inlay_hints{`
`66`	`66`	`highlight = "Comment",`
`67`	`67`	`prefix = " > ",`
`68`	`68`	`aligned = false,`
`69`		`- only_current_line = false`
	`69`	`+ only_current_line = false,`
`70`	`70`	`enabled = { "ChainingHint" }`
`71`	`71`	`}`
`72`	`72`	```