Update dependency graphql to v15 (#373)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

package.json

@@ -43,12 +43,12 @@
     "tslib": "1.11.1"
   },
   "peerDependencies": {
-    "graphql": "^0.11.7 || ^0.13.0 || ^14.0.2"
+    "graphql": "^0.11.7 || ^0.13.0 || ^14.0.2 || ^15.0.0"
   },
   "devDependencies": {
     "bob-the-bundler": "0.3.4",
     "@types/jest": "25.1.4",
-    "graphql": "14.6.0",
+    "graphql": "15.0.0",
     "jest": "25.2.4",
     "ts-jest": "25.3.0",
     "typescript": "3.8.3"

yarn.lock

@@ -1715,12 +1715,10 @@ graphql-tools-fork@9.0.1:
     node-fetch "^2.6.0"
     uuid "^7.0.2"
 
-graphql@14.6.0:
-  version "14.6.0"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-14.6.0.tgz#57822297111e874ea12f5cd4419616930cd83e49"
-  integrity sha512-VKzfvHEKybTKjQVpTFrA5yUq2S9ihcZvfJAtsDBBCuV6wauPu1xl/f9ehgVf0FcEJJs4vz6ysb/ZMkGigQZseg==
-  dependencies:
-    iterall "^1.2.2"
+graphql@15.0.0:
+  version "15.0.0"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.0.0.tgz#042a5eb5e2506a2e2111ce41eb446a8e570b8be9"
+  integrity sha512-ZyVO1xIF9F+4cxfkdhOJINM+51B06Friuv4M66W7HzUOeFd+vNzUn4vtswYINPi6sysjf1M2Ri/rwZALqgwbaQ==
 
 growly@^1.3.0:
   version "1.3.0"
@@ -2077,11 +2075,6 @@ istanbul-reports@^3.0.0:
     html-escaper "^2.0.0"
     istanbul-lib-report "^3.0.0"
 
-iterall@^1.2.2:
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/iterall/-/iterall-1.2.2.tgz#92d70deb8028e0c39ff3164fdbf4d8b088130cd7"
-  integrity sha512-yynBb1g+RFUPY64fTrFv7nsjRrENBQJaX2UL+2Szc9REFrSNm1rpSXHGzhmAy7a9uv3vlvgBlXnf9RqmPH1/DA==
-
 iterall@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/iterall/-/iterall-1.3.0.tgz#afcb08492e2915cbd8a0884eb93a8c94d0d72fea"