Add Python-3.6.9 and Python-3.7.4

Author: utahta

Makefile

@@ -9,7 +9,7 @@ test:
 	@go test -v -race ./...
 
 test/e2e:
-	@go test -tags=e2e -v -race ./...
+	@go test -tags=e2e -timeout=30m -v -race ./...
 
 gen:
 	@go generate ./rc

installer/installer_python_test.go

@@ -24,11 +24,10 @@ func TestPython_Install(t *testing.T) {
 		version string
 	}{
 		{"2.7.16"},
-		{"3.4.9"},
 		{"3.4.10"},
-		{"3.5.6"},
 		{"3.5.7"},
-		{"3.7.3"},
+		{"3.6.9"},
+		{"3.7.4"},
 	}
 
 	for _, testcase := range testcases {

origin/package_test.go

@@ -11,9 +11,8 @@ func TestFindPackage(t *testing.T) {
 		expected string
 	}{
 		{"2.7.15", "2.7.15"},
-		{"3.6.8", "3.6.8"},
-		{"3.7.2", "3.7.2"},
-		{"https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz", "3.6.4"},
+		{"https://www.python.org/ftp/python/3.6.9/Python-3.6.9.tgz", "3.6.9"},
+		{"3.7.4", "3.7.4"},
 	}
 	for _, test := range tests {
 		pkg, err := FindPackage(test.arg)
@@ -27,6 +26,9 @@ func TestFindPackage(t *testing.T) {
 	}
 
 	_, err := FindPackage("1.0.0")
+	if err == nil {
+		t.Fatal("want error, but got nil")
+	}
 	if !strings.HasPrefix(err.Error(), "missing package") {
 		t.Errorf("Expected missing package error, got %v", err)
 	}

origin/python_package.go

@@ -86,11 +86,13 @@ var pythonPackages = map[string]Package{
 	"3.6.6": NewPythonPackage("https://www.python.org/ftp/python/3.6.6/Python-3.6.6.tgz#9a080a86e1a8d85e45eee4b1cd0a18a2"),
 	"3.6.7": NewPythonPackage("https://www.python.org/ftp/python/3.6.7/Python-3.6.7.tgz#c83551d83bf015134b4b2249213f3f85"),
 	"3.6.8": NewPythonPackage("https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tgz#48f393a04c2e66c77bfc114e589ec630"),
+	"3.6.9": NewPythonPackage("https://www.python.org/ftp/python/3.6.9/Python-3.6.9.tgz#ff7cdaef4846c89c1ec0d7b709bbd54d"),
 
 	"3.7.0": NewPythonPackage("https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz#41b6595deb4147a1ed517a7d9a580271"),
 	"3.7.1": NewPythonPackage("https://www.python.org/ftp/python/3.7.1/Python-3.7.1.tgz#99f78ecbfc766ea449c4d9e7eda19e83"),
 	"3.7.2": NewPythonPackage("https://www.python.org/ftp/python/3.7.2/Python-3.7.2.tgz#02a75015f7cd845e27b85192bb0ca4cb"),
 	"3.7.3": NewPythonPackage("https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz#2ee10f25e3d1b14215d56c3882486fcf"),
+	"3.7.4": NewPythonPackage("https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz#68111671e5b2db4aef7b9ab01bf0f9be"),
 }
 
 func (p *pythonPackage) Type() PackageType {