py-gitdb: update to 4.0.5, add py38 subport

- update/pin to version 2.0.6 for PY27
- add noarch

python/py-gitdb/Portfile

@@ -4,24 +4,38 @@ PortSystem          1.0
 PortGroup           python 1.0
 PortGroup           github 1.0
 
-github.setup        gitpython-developers gitdb 2.0.5
+github.setup        gitpython-developers gitdb 4.0.5
 name                py-gitdb
-maintainers         nomaintainer
+revision            0
+
 platforms           darwin
+supported_archs     noarch
 license             BSD
+maintainers         nomaintainer
 
 description         GitDB is a pure-Python git object database
 long_description    ${description}
 
-python.versions     27 36 37
+python.versions     27 36 37 38
 
-checksums           rmd160  b7e127468f5d3859c7e466a36ee739ed75b75d6b \
-                    sha256  8078d816da0b952a46ba761bbb7b29c3c535aa89b039671a58f4641efa384d29 \
-                    size    407348
+checksums           rmd160  b69676ddd9142c8a8b370cd31a8d609872665223 \
+                    sha256  881432a275d50e1dd87e768e9ffc466bffd5054c2e18951a55750397eee58a78 \
+                    size    406782
 
 if {${name} ne ${subport}} {
-    depends_build-append    port:py${python.version}-setuptools
-    depends_run-append      port:py${python.version}-smmap
+    if {${python.version} == 27} {
+        github.setup    gitpython-developers gitdb 2.0.6
+        revision        0
+        checksums       rmd160  8991fdb0bb948686d9af3b91dbb9a9985640690f \
+                        sha256  8358ca2481184108009118ee3437b51b934aa38544405388b6ca21dcbd3f109c \
+                        size    407378
+    }
+
+    depends_build-append \
+                    port:py${python.version}-setuptools
+
+    depends_run-append \
+                    port:py${python.version}-smmap
 
-    livecheck.type          none
+    livecheck.type  none
 }