feature: add pipenv support.

Pipfile

@@ -0,0 +1,13 @@
+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+
+[packages]
+python-telegram-bot = "==8.1.1"
+pony = "*"
+
+[requires]
+python_version = "3.7"

Pipfile.lock

@@ -0,0 +1,49 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "de56c4d5f516205e99d141cd7d372f67b602b6f981306971c01ffe25a5abf5c6"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3.7"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "certifi": {
+            "hashes": [
+                "sha256:046832c04d4e752f37383b628bc601a7ea7211496b4638f6514d0e5b9acc4939",
+                "sha256:945e3ba63a0b9f577b1395204e13c3a231f9bc0223888be653286534e5873695"
+            ],
+            "version": "==2019.6.16"
+        },
+        "future": {
+            "hashes": [
+                "sha256:67045236dcfd6816dc439556d009594abf643e5eb48992e36beac09c2ca659b8"
+            ],
+            "version": "==0.17.1"
+        },
+        "pony": {
+            "hashes": [
+                "sha256:55bb9d4d12029d8c2bbbc7a284970e72225035db7e6370c0a15ec93d1886fe88"
+            ],
+            "index": "pypi",
+            "version": "==0.7.10"
+        },
+        "python-telegram-bot": {
+            "hashes": [
+                "sha256:238c4a88b09d93c52d413bcf7e7fe14dfeb02f5f9222ffe4cafd4bd3d55489a3",
+                "sha256:997983e5082dc6aa811bce3a6014731201fc64b0a9c02fdb26beac686029d94b"
+            ],
+            "index": "pypi",
+            "version": "==8.1.1"
+        }
+    },
+    "develop": {}
+}