chore: fix JSON and grammar (#93)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c32a97e..aedcd5f 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -18,7 +18,7 @@
 
 # Contributing to Apache OpenWhisk
 
-Anyone can contribute to the OpenWhisk project and we welcome your contributions.
+Anyone can contribute to the OpenWhisk project, and we welcome your contributions.
 
 There are multiple ways to contribute: report bugs, improve the docs, and
 contribute code, but you must follow these prerequisites and guidelines:
@@ -47,7 +47,7 @@
 list to see if your issue has already been raised.
 
 A good bug report is one that make it easy for us to understand what you were trying to do and what went wrong. 
-Provide as much context as possible so we can try to recreate the issue.
+Provide as much context as possible, so we can try to recreate the issue.
 
 ### Discussion
 
diff --git a/README.md b/README.md
index b96f1c3..01ef55f 100644
--- a/README.md
+++ b/README.md
@@ -68,7 +68,7 @@
 - `gcmVisibility`: private/public - Visibility of this notification, which affects how and when the notifications are revealed on a secure locked screen.
 - `gcmPayload`: Custom JSON payload that will be sent as part of the notification message. For example: `-p gcmPayload "{\"hi\":\"hello\"}"`
 - `gcmPriority`: Sets the priority of the message.
-- `gcmSound`: The sound file (on device) that will be attempted to play when the notification arrives on the device.
+- `gcmSound`: The sound file (on the device) that will be attempted to play when the notification arrives on the device.
 - `gcmTimeToLive`: This parameter specifies how long (in seconds) the message will be kept in GCM storage if the device is offline.
 - `gcmStyleType`: Specifies the type of expandable notifications. The possible values are `bigtext_notification`, `picture_notification`, `inbox_notification`.
 - `gcmStyleTitle`: Specifies the title of the notification. The title is displayed when the notification is expanded. Title must be specified for all three expandable notification.
diff --git a/tests/template_credentials.json b/tests/template_credentials.json
index 4849df0..d023f56 100644
--- a/tests/template_credentials.json
+++ b/tests/template_credentials.json
@@ -5,7 +5,7 @@
         "credentials": {
             "apiKey": "XXXXXXXX",
             "apiToken": "YYYYYYY",
-            "base_uri": "https://openwhisk.ng.bluemix.net/api/v1",
+            "base_uri": "https://openwhisk.ng.bluemix.net/api/v1"
         }
     }],
     "another_service": [{
@@ -14,7 +14,7 @@
         "credentials": {
             "apiKey": "ZZZZZZZZZZ",
             "apiToken": "MMMMMMMMMM",
-            "base_uri": "https://openwhisk.ng.bluemix.net/api/v1",
+            "base_uri": "https://openwhisk.ng.bluemix.net/api/v1"
         }
     }]
 }