Use `exec` instead of `system` in `minirake` for exit status

#### Before this patch: ```console $ ./minirake --foo; echo $? invalid option: --foo 0 ``` #### After this patch: ```console $ ./minirake --foo; echo $? invalid option: --foo 1 ```

Use `exec` instead of `system` in `minirake` for exit status
#### Before this patch: ```console $ ./minirake --foo; echo $? invalid option: --foo 0 ``` #### After this patch: ```console $ ./minirake --foo; echo $? invalid option: --foo 1 ```
66349bce · KOBAYASHI Shuji · 089bb6ac · 66349bce
Commit 66349bce authored Dec 21, 2019 by KOBAYASHI Shuji
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minirake minirake +1 -1

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--- a/minirake
+++ b/minirake
 #! /usr/bin/env ruby
-system "rake", *ARGV
+exec "rake", *ARGV