linux-dpdk: bump recommended dpdk version to 18.11

Signed-off-by: Matias Elo <[email protected]>
Reviewed-by: Petri Savolainen <[email protected]>

platform/linux-dpdk/README

@@ -23,20 +23,20 @@ Prerequisites and considerations:
   (4.4.0 kernel).
 - DPDK only works on a selected range of network cards. The list of known and
   supported devices can be found in the DPDK documentation:
-      http://doc.dpdk.org/guides-17.11/nics/index.html
+      http://doc.dpdk.org/guides-18.11/nics/index.html
 
 
 2. Preparing DPDK
 =================================================
 
 Fetching the DPDK code:
 ----------------------
-Right now odp-dpdk supports DPDK v17.11 and v18.11:
-    git clone http://dpdk.org/git/dpdk-stable --branch 17.11 --depth 1 ./<dpdk-dir>
+Right now odp-dpdk supports DPDK v18.11 (recommended version) and v17.11:
+    git clone http://dpdk.org/git/dpdk-stable --branch 18.11 --depth 1 ./<dpdk-dir>
 
 or
 
-    git clone http://dpdk.org/git/dpdk-stable --branch 18.11 --depth 1 ./<dpdk-dir>
+    git clone http://dpdk.org/git/dpdk-stable --branch 17.11 --depth 1 ./<dpdk-dir>
 
 Compile DPDK:
 ------------