README: Update build instructions for PLDM

The currently documented steps for running unit tests are outdated and
no longer work with recent Meson versions. Update the instructions to
ensure they work correctly with the latest Meson build system.

Change-Id: I010c6b8e5967de42f56c488feaa02b6f9a1fd026
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/README.md b/README.md
index 46983f6..fbe7a67 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@
 To build the PLDM project, follow these steps:
 
 ```bash
-meson setup build && ninja -C build
+meson setup build && meson compile -C build
 ```
 
 ### To run unit tests
@@ -49,7 +49,7 @@
 The simplest way of running the tests is as described by the meson man page:
 
 ```bash
-meson setup builddir && meson setup test -C builddir
+meson test -C build
 ```
 
 Alternatively, tests can be run in the OpenBMC CI docker container using