README: Move to "meson setup [options]"

Fixes the warning:
WARNING: Running the setup command as `meson [options]` instead of
`meson setup [options]` is ambiguous and deprecated.

Tested: The following work:
meson setup build
ninja -C build

Change-Id: I4d45fab5eb25d9355f21a8da260ee52b5ed4ba18
Signed-off-by: Pavithra Barithaya <pavithra.b@ibm.com>
diff --git a/README.md b/README.md
index e23e30c..4062280 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 Need `meson` and `ninja`. Alternatively, source an OpenBMC ARM/x86 SDK.
 
 ```
-meson build && ninja -C build
+meson setup build && ninja -C build
 ```
 
 ## To run unit tests
@@ -11,14 +11,14 @@
 The simplest way of running the tests is as described by the meson man page:
 
 ```
-meson builddir && meson test -C builddir
+meson setup builddir && meson setup test -C builddir
 ```
 
 Alternatively, tests can be run in the OpenBMC CI docker container, or with an
 OpenBMC x86 sdk(see below for x86 steps).
 
 ```
-meson -Doe-sdk=enabled build
+meson setup -Doe-sdk=enabled build
 ninja -C build test
 ```