update tests to know about more pythons

test/fixtures/python3_4/runtime.txt

+python-3.4.9

test/fixtures/python3_5/requirements.txt

+requests
\ No newline at end of file

test/fixtures/python3_5/runtime.txt

+python-3.5.6

test/fixtures/python3_6/requirements.txt

+requests
\ No newline at end of file

test/fixtures/python3_7/requirements.txt

+requests
\ No newline at end of file

test/fixtures/python3_7/runtime.txt

+python-3.7.0

test/run

@@ -86,12 +86,30 @@ testPython2() {
     assertCapturedSuccess
 }
 
-testPython3() {
-  compile "python3"
+testPython3_4() {
+  compile "python3_4"
+  assertCaptured "python-3.4.9"
+  assertCapturedSuccess
+}
+
+testPython3_5() {
+  compile "python3_5"
+  assertCaptured "python-3.5.6"
+  assertCapturedSuccess
+}
+
+testPython3_6() {
+  compile "python3_6"
   assertCaptured "python-3.6.6"
   assertCapturedSuccess
 }
 
+testPython3_7() {
+  compile "python3_7"
+  assertCaptured "python-3.7.0"
+  assertCapturedSuccess
+}
+
 testGitEgg() {
   compile "git-egg"
   assertCaptured "requests"