Pin libjuju version to 2.8.2

This fixes bug 1144

Change-Id: I72580c2a2c4614bad2847b436d376ad9b4636031
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/setup.py b/setup.py
index f7936fc..0c874f1 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
     packages=find_packages(
         exclude=["*.tests", "*.tests.*", "tests.*", "tests"]),
     install_requires=[
-        'juju==2.8.1',
+        'juju==2.8.2',
         'paramiko',
         'pyasn1>=0.4.4',
         'kubernetes==10.0.1'