Fix unsafe packages being locked

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - Fixed handling of duplicate dependencies with different constraints.
 - Fixed detection of new prereleases.
+- Fixed unsafe packages being locked.
 
 
 ## [0.10.3] - 2018-06-04

poetry/puzzle/provider.py

@@ -275,6 +275,10 @@ class Provider:
         else:
             dependencies = package.requires
 
+        dependencies = [
+            dep for dep in dependencies if dep.name not in self.UNSAFE_PACKAGES
+        ]
+
         if not self._package.python_constraint.allows_any(package.python_constraint):
             return [
                 Incompatibility(