Switch around PATTERN and PATH cli arguments

While this does break existing workflows, there are two main arguments
for doing this:
1. it is a more a common workflow, that the path is kept constant while
   the query is iterated upon. Having the query as the last positional
   argument makes it easier to go up in history and edit the query.
2. it sets things up to for other interactive input methods for queries.

Author: fabianfreyer

src/cli.rs

@@ -48,7 +48,7 @@ pub fn parse_arguments() -> Args {
                 .help("Search pattern.")
                 .long_help(help::PATTERN)
                 .required(true)
-                .index(1),
+                .index(2),
         )
         .arg(
             Arg::new("p")
@@ -64,7 +64,7 @@ pub fn parse_arguments() -> Args {
                 .help("A file or directory to search.")
                 .long_help(help::PATH)
                 .required(true)
-                .index(2),
+                .index(1),
         )
         .arg(
             Arg::new("v")