2.48.2c: Update image id and digest.

Author: elgalu

CHANGELOG.md

@@ -22,8 +22,8 @@ Get container versions run `docker exec grid versions`
   + Python: 2.7.10
   + Sauce Connect 4.3.11, build 1757 2b421bb
   + BrowserStack Local version 4
-  + Image ID: TBD
-  + Digest: sha256:TBD
+  + Image ID: 838fd1a3e07bb1c38cb50bd5115100831863a0e53f382203d2736c5cb6f0175b
+  + Digest: sha256:8640b744b4ce63a67081f3a74a094d5a2aa425b594cd83fbbcbc8e8aa2c8005c
 
 ## 2.48.2b (2015-11-04)
  + Upgrade to Chrome to 46.0.2490.80

README.md

@@ -209,7 +209,7 @@ There are also additional steps you can take to ensure you're using the correct
 You can simply verify that image id is indeed the correct one.
 
     # e.g. full image id for tag 2.48.2c
-    export IMGID=TBD
+    export IMGID=838fd1a3e07bb1c38cb50bd5115100831863a0e53f382203d2736c5cb6f0175b
     if docker inspect -f='{{.Id}}' elgalu/selenium:2.48.2c |grep ${IMGID} &> /dev/null; then
         echo "Image ID tested ok"
     else
@@ -221,7 +221,7 @@ You can simply verify that image id is indeed the correct one.
 Given docker.io currently allows to push the same tag image twice this represent a security concern but since docker >= 1.6.2 is possible to fetch the digest sha256 instead of the tag so you can be sure you're using the exact same docker image every time:
 
     # e.g. sha256 for tag 2.48.2c
-    export SHA=TBD
+    export SHA=8640b744b4ce63a67081f3a74a094d5a2aa425b594cd83fbbcbc8e8aa2c8005c
     docker pull elgalu/selenium@sha256:${SHA}
 
 You can find all digests sha256 and image ids per tag in the [CHANGELOG](./CHANGELOG.md) so as of now you just need to trust the sha256 in the CHANGELOG. Bullet proof is to fork this project and build the images yourself if security is a big concern.