Fix prefix so that tags are properly detected.

_version.py

@@ -41,7 +41,7 @@ def get_config():
     cfg = VersioneerConfig()
     cfg.VCS = "git"
     cfg.style = "pep440"
-    cfg.tag_prefix = "'prrt-'"
+    cfg.tag_prefix = "prrt-"
     cfg.parentdir_prefix = "None"
     cfg.versionfile_source = "_version.py"
     cfg.verbose = False

setup.cfg

@@ -6,4 +6,4 @@ universal=1
 VCS = git
 style = pep440
 versionfile_source = _version.py
-tag_prefix = 'prrt-'
+tag_prefix = prrt-