We must specify lower-bound for ptyprocess

Problem:

- user installs pexpect==3.2 and ptyprocess==0.4
- change is made to ptyprocess, 0.5 is available
- change is made to pexpect, 4.0 is available
- user wishes to upgrade, issues "pip install --upgrade pexpect"
- the current version of ptyprocess (0.4) remains installed.

Solution:

- Specify lowerbound '>=0.5' to ensure that existing pexpect
  installations receive new version of ptyprocess.

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 126749a..feb5e64 100644
--- a/setup.py
+++ b/setup.py
@@ -61,5 +61,5 @@ setup (name='pexpect',
         'Topic :: System :: Software Distribution',
         'Topic :: Terminals',
     ],
-    install_requires=['ptyprocess'],
+    install_requires=['ptyprocess>=0.5'],
 )