Updating package.xml to fix dependencies and update format (#105)

Author: danthony06

gpsd_client/package.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<package>
+<package format="2">
   <name>gpsd_client</name>
   <version>0.3.4</version>
   <description>connects to a GPSd server and broadcasts GPS fixes 
@@ -17,9 +17,9 @@
   <buildtool_depend>catkin</buildtool_depend>
 
   <build_depend>roscpp</build_depend>
-  <build_depend>gps_common</build_depend>
-  <build_depend>sensor_msgs</build_depend>
-  <build_depend>pkg-config</build_depend>
   <build_depend>libgps</build_depend>
 
+  <depend>gps_common</depend>
+  <depend>sensor_msgs</depend>
+
 </package>