Set minimum version to 3.6

3.6 is not EOL yet, let's not rush to requiring anything higher just
yet.

2 files changed, 6 insertions, 1 deletions

diff --git a/README.md b/README.md
index 0067010..7659b50 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ Dependencies
 
 Required:
 
-* **Python 3**
+* **Python 3**: Minimum of 3.6.
 
 * **Git**
 
diff --git a/setup.py b/setup.py
index 95bc98a..ec0d3ca 100644
--- a/setup.py
+++ b/setup.py
@@ -28,6 +28,7 @@ import glob
 import os
 import shutil
 import subprocess
+import sys
 
 
 class Build(build):
@@ -95,6 +96,10 @@ class Install(install):
                          'share/lorry/hg-fast-export/plugins'))
 
 
+if sys.version_info < (3, 6):
+    print("lorry requires Python 3.6+", file=sys.stderr)
+    sys.exit(1)
+
 setup(name='lorry',
       description='FIXME',
       long_description='''\