Fix setting an explicit version in version command

CHANGELOG.md

@@ -10,6 +10,7 @@
 - Fixed bad version number being picked with private repositories.
 - Fixed handling of duplicate dependencies with same constraint.
 - Fixed installation from custom repositories.
+- Fixed setting an explicit version in `version` command.
 
 
 ## [0.10.2] - 2018-05-31

poetry/console/commands/version.py

@@ -81,6 +81,6 @@ patch, minor, major, prepatch, preminor, premajor, prerelease.
             else:
                 new = version.next_patch.first_prerelease
         else:
-            new = rule
+            new = Version.parse(rule)
 
         return new

tests/console/commands/test_version.py

@@ -31,6 +31,7 @@ def command():
         ("1.2.3beta1", "prerelease", "1.2.3-beta.2"),
         ("1.2.3b1", "prerelease", "1.2.3-beta.2"),
         ("1.2.3", "prerelease", "1.2.4-alpha.0"),
+        ("0.0.0", "1.2.3", "1.2.3"),
     ],
 )
 def test_increment_version(version, rule, expected, command):