update yaml module to 1.7.1

ran `yarn upgrade yaml@^1.7.1`

Author: Jim Sheldon

package.json

@@ -14,6 +14,6 @@
     "github4": "^1.1.1",
     "globule": "^1.2.1",
     "http-signature": "^1.2.0",
-    "yaml": "^1.3.2"
+    "yaml": "^1.7.1"
   }
 }

yarn.lock

@@ -2,6 +2,13 @@
 # yarn lockfile v1
 
 
+"@babel/runtime@^7.5.5":
+  version "7.6.2"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.6.2.tgz#c3d6e41b304ef10dcf13777a33e7694ec4a9a6dd"
+  integrity sha512-EXxN64agfUqqIGeEjI5dL5z0Sw0ZwWo1mLTi4mQowCZ42O59b7DRpZAnTC6OqdF28wMBMFKNb/4uFGrVaigSpg==
+  dependencies:
+    regenerator-runtime "^0.13.2"
+
 accepts@~1.3.5:
   version "1.3.5"
   resolved "https://registry.yarnpkg.com/accepts/-/accepts-1.3.5.tgz#eb777df6011723a3b14e8a72c0805c8e86746bd2"
@@ -471,6 +478,11 @@ raw-body@2.3.3:
     iconv-lite "0.4.23"
     unpipe "1.0.0"
 
+regenerator-runtime@^0.13.2:
+  version "0.13.3"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.3.tgz#7cf6a77d8f5c6f60eb73c5fc1955b2ceb01e6bf5"
+  integrity sha512-naKIZz2GQ8JWh///G7L3X6LaQUAMp2lvb1rvwwsURe/VXwD6VMfr+/1NuNw3ag8v2kY1aQ/go5SNn79O9JU7yw==
+
 safe-buffer@5.1.2:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
@@ -592,7 +604,9 @@ wrappy@1:
   resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
   integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
 
-yaml@^1.3.2:
-  version "1.3.2"
-  resolved "https://registry.yarnpkg.com/yaml/-/yaml-1.3.2.tgz#3de83fafed3799fb0b0029c12f80035bc7611303"
-  integrity sha512-ZZZIdcApMRcAez37EVrtCim+8JUESX0zRcsv+HMfatIX79cX22CAnVkxDrZhAmzsnka2nb/mvaTybzDYcnrIew==
+yaml@^1.7.1:
+  version "1.7.1"
+  resolved "https://registry.yarnpkg.com/yaml/-/yaml-1.7.1.tgz#86db1b39a6434a7928d3750cbe08303a50a24d6b"
+  integrity sha512-sR0mJ2C3LVBgMST+0zrrrsKSijbw64bfHmTt4nEXLZTZFyIAuUVARqA/LO5kaZav2OVQMaZ+5WRrZv7QjxG3uQ==
+  dependencies:
+    "@babel/runtime" "^7.5.5"