version: take --short into account when updating

Fixes python-poetry#3577.

This makes `poetry version --short <version>` output only the updated
version number, similarly to `poetry version --short`.

poetry/console/commands/version.py

@@ -48,11 +48,14 @@ def handle(self):
                 self.poetry.package.pretty_version, version
             )
 
-            self.line(
-                "Bumping version from <b>{}</> to <fg=green>{}</>".format(
-                    self.poetry.package.pretty_version, version
+            if self.option("short"):
+                self.line("{}".format(version))
+            else:
+                self.line(
+                    "Bumping version from <b>{}</> to <fg=green>{}</>".format(
+                        self.poetry.package.pretty_version, version
+                    )
                 )
-            )
 
             content = self.poetry.file.read()
             poetry_content = content["tool"]["poetry"]

tests/console/commands/test_version.py

@@ -51,3 +51,13 @@ def test_version_show(tester):
 def test_short_version_show(tester):
     tester.execute("--short")
     assert "1.2.3\n" == tester.io.fetch_output()
+
+
+def test_version_update(tester):
+    tester.execute("2.0.0")
+    assert "Bumping version from 1.2.3 to 2.0.0\n" == tester.io.fetch_output()
+
+
+def test_short_version_update(tester):
+    tester.execute("--short 2.0.0")
+    assert "2.0.0\n" == tester.io.fetch_output()