chore(package): update lockfile yarn.lock

Author: greenkeeper[bot]

yarn.lock

@@ -638,7 +638,7 @@ acorn@^5.5.3:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
   integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
 
-acorn@^6.0.1:
+acorn@^6.0.1, acorn@^6.1.0:
   version "6.1.0"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.1.0.tgz#b0a3be31752c97a0f7013c5f4903b71a05db6818"
   integrity sha512-MW/FjM+IvU9CgBzjO3UIPCE2pyEwUsoFl+VGdczOPEdxfGFjuKny/gN54mOuX7Qxmb9Rg9MCn2oKiSUeW+pjrw==
@@ -3699,13 +3699,14 @@ rollup-pluginutils@^2.3.0:
     estree-walker "^0.5.2"
     micromatch "^2.3.11"
 
-rollup@0.67.0:
-  version "0.67.0"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.67.0.tgz#16d4f259c55224dded6408e7666b7731500797a3"
-  integrity sha512-p34buXxArhwv9ieTdHvdhdo65Cbig68s/Z8llbZuiX5e+3zCqnBF02Ck9IH0tECrmvvrJVMws32Ry84hTnS1Tw==
+rollup@1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.2.0.tgz#4d487f542b16984955409585ff19585fe3cfd6cc"
+  integrity sha512-oHNv2NSX5y/rY6W8MuKW8BVQwpIfwfTNp4PJiQYR7cLcBYeR5wP0LsPqKNw3Heji6hYci5Nd53q/fVfTuNe3GA==
   dependencies:
     "@types/estree" "0.0.39"
     "@types/node" "*"
+    acorn "^6.1.0"
 
 rsvp@^3.3.3:
   version "3.6.2"