[dia] Update README.md corrected typo, instal to install.

[Zander <zbrown src gnome org>]

commit 70b7dec2f8420a0d576ce2792d135088cdfc7f24
Author: FullTimeLinux <fulltimelinux gmail com>
Date:   Sun Apr 19 22:40:06 2020 +0000

    Update README.md corrected typo, instal to install.

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index 4ed67943..4077ea5f 100644
--- a/README.md
+++ b/README.md
@@ -94,7 +94,7 @@ anybody to contribute patches:
 of the following ways:
   2. Local laptop, desktop, etc
   3. Premade box from https://www.osboxes.org/ or similar
-  4. Instal a virtual machine from ISO
+  4. Install a virtual machine from ISO
   5. Follow the compilation & installation instructions for Dia
   6. See if you can get all the features of Dia running.
   7. Try various meson options: https://mesonbuild.com/Configuring-a-build-directory.html