Provide Python 3 matplotlib

Once I get around to making numpy/scipy imported for Python 3, I'll
probably upgrade everything to Python 3 and drop Python 2 support from
the codebase, but I don't feel like doing that quite yet.

Change-Id: I164c8fbb3ce922a83b56e46f5cc432004c3a989c
diff --git a/y2016/control_loops/python/BUILD b/y2016/control_loops/python/BUILD
index c49a250..65964fd 100644
--- a/y2016/control_loops/python/BUILD
+++ b/y2016/control_loops/python/BUILD
@@ -61,7 +61,7 @@
         "//external:python-gflags",
         "//external:python-glog",
         "//frc971/control_loops/python:controls",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )
 
@@ -94,7 +94,7 @@
         "//external:python-gflags",
         "//external:python-glog",
         "//frc971/control_loops/python:controls",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )
 
@@ -111,7 +111,7 @@
         "//external:python-gflags",
         "//external:python-glog",
         "//frc971/control_loops/python:controls",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )
 
@@ -140,7 +140,7 @@
         "//external:python-gflags",
         "//external:python-glog",
         "//frc971/control_loops/python:controls",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )
 
@@ -157,7 +157,7 @@
         "//external:python-gflags",
         "//external:python-glog",
         "//frc971/control_loops/python:controls",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )