Add test matrix for Python versions

.circleci/config.yml

@@ -0,0 +1,43 @@
+version: 2
+
+templates:
+  job_template: &job_template
+    working_directory: /go/src/github.com/DataDog/go-python3
+    docker:
+      - image: golang:1.11.2
+
+jobs:
+  python3.5:
+    <<: *job_template
+    steps:
+      - checkout
+      - run: echo "deb http://deb.debian.org/debian unstable main" >> /etc/apt/sources.list
+      - run: apt-get update && apt-get install -y python3.5-dev
+      - run: cp /usr/lib/x86_64-linux-gnu/pkgconfig/python-3.5.pc /usr/lib/x86_64-linux-gnu/pkgconfig/python3.pc
+      - run: cd test && go build && ./test
+
+  python3.6:
+    <<: *job_template
+    steps:
+      - checkout
+      - run: echo "deb http://deb.debian.org/debian unstable main" >> /etc/apt/sources.list
+      - run: apt-get update && apt-get install -y python3.6-dev
+      - run: cp /usr/lib/x86_64-linux-gnu/pkgconfig/python-3.6.pc /usr/lib/x86_64-linux-gnu/pkgconfig/python3.pc
+      - run: cd test && go build && ./test
+
+  python3.7:
+    <<: *job_template
+    steps:
+      - checkout
+      - run: echo "deb http://deb.debian.org/debian unstable main" >> /etc/apt/sources.list
+      - run: apt-get update && apt-get install -y python3.7-dev
+      - run: cp /usr/lib/x86_64-linux-gnu/pkgconfig/python-3.7.pc /usr/lib/x86_64-linux-gnu/pkgconfig/python3.pc
+      - run: cd test && go build && ./test
+
+workflows:
+  version: 2
+  build_test_deploy:
+    jobs:
+      - python3.5
+      - python3.6
+      - python3.7

test/main.go

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+package main
+
+/*
+#cgo pkg-config: python3
+#include "Python.h"
+*/
+import "C"
+
+import (
+	"fmt"
+	python "github.com/DataDog/go-python3"
+)
+
+func main() {
+	C.Py_Initialize()
+	ret, err := python.PyRun_AnyFile("test.py")
+	fmt.Printf("%d %v\n", ret, err)
+}

test/test.py

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+import sys
+
+print(sys.version)