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/frc971/control_loops/python/BUILD b/frc971/control_loops/python/BUILD
index b3aa2c0..50764c7 100644
--- a/frc971/control_loops/python/BUILD
+++ b/frc971/control_loops/python/BUILD
@@ -11,7 +11,7 @@
         "//external:python-gflags",
         "//external:python-glog",
         "//frc971/control_loops/python:controls",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )
 
@@ -59,7 +59,7 @@
     deps = [
         ":controls",
         ":python_init",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )
 
@@ -72,7 +72,7 @@
     deps = [
         ":controls",
         ":python_init",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )
 
@@ -133,7 +133,7 @@
         "//external:python-glog",
         "//frc971/control_loops/python:controls",
         "//y2016/control_loops/python:polydrivetrain_lib",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )
 
@@ -146,7 +146,7 @@
         ":controls",
         "//aos/util:py_trapezoid_profile",
         "//frc971/control_loops:python_init",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )
 
@@ -159,7 +159,7 @@
         ":controls",
         "//aos/util:py_trapezoid_profile",
         "//frc971/control_loops:python_init",
-        "@matplotlib",
+        "@matplotlib_repo//:matplotlib2.7",
     ],
 )