README: Fix grammar

Fix two grammar issues:

- "standard  autotools  packages ---> "standard  autotools  package"
- "If you are install" ---> "If you are installing"

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/README b/README
index 7eeae38..26cab9d 100644
--- a/README
+++ b/README
@@ -15,7 +15,7 @@
 Compiling
 ---------
 
-libdrm  is  a  standard  autotools  packages and  follows  the  normal
+libdrm  is  a  standard  autotools  package and  follows  the  normal
 configure, build  and install steps.   The first step is  to configure
 the package, which is done by running the configure shell script:
 
@@ -37,5 +37,5 @@
 
 	make install
 
-If you are install into a system location, you will need to be root to
-perform the install step.
+If you are installing into a system location, you will need to be root
+to perform the install step.