Add rstcheck tool

spec/test/Pipfile

@@ -6,6 +6,7 @@ verify_ssl = true
 [dev-packages]
 ipython = "*"
 ipdb = "*"
+rstcheck = "*"
 
 [packages]
 behave = "*"

spec/test/Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "203306870267e9afb4beb819586ddc910310d39399cbd7294a6b9148c88dd3b3"
+            "sha256": "d60d486e13f1ad7384822a59b10f68fa1262dc9b1812d42cbac35ca585a3bb7a"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -54,9 +54,9 @@
         },
         "parse": {
             "hashes": [
-                "sha256:1b68657434d371e5156048ca4a0c5aea5afc6ca59a2fea4dd1a575354f617142"
+                "sha256:a5fca7000c6588d77bc65c28f3f21bfce03b5e44daa8f9f07c17fe364990d717"
             ],
-            "version": "==1.12.0"
+            "version": "==1.12.1"
         },
         "parse-type": {
             "hashes": [
@@ -103,6 +103,14 @@
             ],
             "version": "==4.4.0"
         },
+        "docutils": {
+            "hashes": [
+                "sha256:6c4f696463b79f1fb8ba0c594b63840ebd41f059e92b31957c46b74a4599b6d0",
+                "sha256:9e4d7ecfc600058e07ba661411a2b7de2fd0fafa17d1a7f7361cd47b1175c827",
+                "sha256:a2aeea129088da402665e92e0b25b04b073c04b2dce4ab65caaa38b7ce2e1a99"
+            ],
+            "version": "==0.15.2"
+        },
         "ipdb": {
             "hashes": [
                 "sha256:473fdd798a099765f093231a8b1fabfa95b0b682fce12de0c74b61a4b4d8ee57"
@@ -176,6 +184,13 @@
             ],
             "version": "==2.4.2"
         },
+        "rstcheck": {
+            "hashes": [
+                "sha256:92c4f79256a54270e0402ba16a2f92d0b3c15c8f4410cb9c57127067c215741f"
+            ],
+            "index": "pypi",
+            "version": "==3.3.1"
+        },
         "six": {
             "hashes": [
                 "sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c",