Fix tilde operator parsing in semver package

poetry/semver/version_parser.py

@@ -111,7 +111,7 @@ class VersionParser:
             elif m.group(3):
                 position = 2
             elif m.group(2):
-                position = 1
+                position = 2
             else:
                 position = 0
 

tests/mixology/fixtures/case/django.json

@@ -17,7 +17,7 @@
       "dependencies": [
         {
           "name": "django",
-          "version": "1.4.1",
+          "version": "1.4.3",
           "dependencies": [
 
           ]

tests/semver/test_main.py

@@ -49,10 +49,10 @@ from poetry.semver import sort, rsort, statisfies, satisfied_by
         ('2.1.3', '1.2.* || 2.*'),
         ('1.2.3', '1.2.* || 2.*'),
         ('1.2.3', '*'),
-        ('2.9.0', '~2.4'),  # >= 2.4.0 < 3.0.0
+        ('2.9.0', '^2.4'),  # >= 2.4.0 < 3.0.0
         ('2.4.5', '~2.4'),
         ('1.2.3', '~1'),  # >= 1.0.0 < 2.0.0
-        ('1.4.7', '~1.0'),  # >= 1.0.0 < 2.0.0
+        ('1.0.7', '~1.0'),  # >= 1.0.0 < 1.1.0
         ('1.0.0', '>=1'),
         ('1.0.0', '>= 1'),
         ('1.2.8', '>1.2'),  # > 1.2.0
@@ -135,8 +135,8 @@ def test_statisfies_negative(version, constraint):
     [
         (
             '~1.0',
-            ['1.0', '1.2', '1.9999.9999', '2.0', '2.1', '0.9999.9999'],
-            ['1.0', '1.2', '1.9999.9999'],
+            ['1.0', '1.0.9', '1.2', '2.0', '2.1', '0.9999.9999'],
+            ['1.0', '1.0.9'],
         ),
         (
             '>1.0 <3.0 || >=4.0',

tests/semver/test_version_parser.py

@@ -64,13 +64,14 @@ def test_parse_constraints_wildcard(parser, input, min, max):
     'input,min,max',
     [
         ('~v1', Constraint('>=', '1.0.0.0'), Constraint('<', '2.0.0.0')),
-        ('~1.0', Constraint('>=', '1.0.0.0'), Constraint('<', '2.0.0.0')),
+        ('~1.0', Constraint('>=', '1.0.0.0'), Constraint('<', '1.1.0.0')),
         ('~1.0.0', Constraint('>=', '1.0.0.0'), Constraint('<', '1.1.0.0')),
-        ('~1.2', Constraint('>=', '1.2.0.0'), Constraint('<', '2.0.0.0')),
+        ('~1.2', Constraint('>=', '1.2.0.0'), Constraint('<', '1.3.0.0')),
         ('~1.2.3', Constraint('>=', '1.2.3.0'), Constraint('<', '1.3.0.0')),
         ('~1.2.3.4', Constraint('>=', '1.2.3.4'), Constraint('<', '1.2.4.0')),
-        ('~1.2-beta', Constraint('>=', '1.2.0.0-beta'), Constraint('<', '2.0.0.0')),
-        ('~1.2-b2', Constraint('>=', '1.2.0.0-beta.2'), Constraint('<', '2.0.0.0')),
+        ('~1.2-beta', Constraint('>=', '1.2.0.0-beta'), Constraint('<', '1.3.0.0')),
+        ('~1.2-b2', Constraint('>=', '1.2.0.0-beta.2'), Constraint('<', '1.3.0.0')),
+        ('~0.3', Constraint('>=', '0.3.0.0'), Constraint('<', '0.4.0.0')),
     ]
 )
 def test_parse_constraints_tilde(parser, input, min, max):