tutorial: typo (#111)

Author: ulysses4ever

examples/simple-grep/README.md

@@ -3,7 +3,7 @@
 The file contains an introduction tutorial on building a simple CLI tool with
 Iris.
 
-We're going to build a tool for finding finding lines that contain a given
+We're going to build a tool for finding lines that contain a given
 string in a given file. Like a very simple clone of
 [grep](https://www.gnu.org/software/grep/) or more modern
 [ripgrep](https://github.com/BurntSushi/ripgrep)
@@ -404,4 +404,4 @@ If you wish to hack on this example more, try implementing the following improve
 
 * Add the `[-i | --ignore-case]` option to support the case-insensitive mode
 * Highlight the found part of the string inside the found line
-* Search in multiple files inside the directory
+* Search in multiple files inside the directory