Upgrade to go 1.15

go.mod

@@ -1,6 +1,6 @@
 module github.com/0xProject/0x-mesh
 
-go 1.14
+go 1.15
 
 replace (
 	// github.com/ethereum/go-ethereum => github.com/0xProject/go-ethereum wasm-support

yarn.lock

@@ -468,15 +468,6 @@
     bignumber.js "~9.0.0"
     ethereum-types "^3.1.0"
 
-"@0x/types@^3.1.3":
-  version "3.1.3"
-  resolved "https://registry.yarnpkg.com/@0x/types/-/types-3.1.3.tgz#f5edbcb0fe38f6c2979cd6cedacf7c132a72aa23"
-  integrity sha512-6lHKOlr90zN5P/Rrg/SfdHXUASU4ZDBr5Y4IBwwKrrPo/XetxNFxdZQcDxmVJT8aG13f7r6xnDwwlEyFtvnWEQ==
-  dependencies:
-    "@types/node" "*"
-    bignumber.js "~9.0.0"
-    ethereum-types "^3.1.1"
-
 "@0x/types@^3.2.0":
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/@0x/types/-/types-3.2.0.tgz#490627e9440c3ff4e4660b0c10960ccd02d7105f"
@@ -508,17 +499,6 @@
     ethereum-types "^3.1.0"
     popper.js "1.14.3"
 
-"@0x/typescript-typings@^5.1.0":
-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/@0x/typescript-typings/-/typescript-typings-5.1.0.tgz#8e81a8605e3ef02bea16b73e4bd229ce010912c6"
-  integrity sha512-djQWgwabVgQ5jH3KFlrzOdLVZhYRpOIwlZtvkeznjToi8Xw2YXBoX0OL6ZJ/PhyNCEgtopO11HsHTR2mcyKyIg==
-  dependencies:
-    "@types/bn.js" "^4.11.0"
-    "@types/react" "*"
-    bignumber.js "~9.0.0"
-    ethereum-types "^3.1.1"
-    popper.js "1.14.3"
-
 "@0x/typescript-typings@^5.1.1":
   version "5.1.1"
   resolved "https://registry.yarnpkg.com/@0x/typescript-typings/-/typescript-typings-5.1.1.tgz#e5216f33e5859d48cd441a059da9c56c2b6df36a"
@@ -568,25 +548,6 @@
     js-sha3 "^0.7.0"
     lodash "^4.17.11"
 
-"@0x/utils@^5.5.0":
-  version "5.5.0"
-  resolved "https://registry.yarnpkg.com/@0x/utils/-/utils-5.5.0.tgz#b167a09e3a950035e45e05050f95be709b4d2b79"
-  integrity sha512-2rDKKzdbPEjKXv5HSrkB6VzukZrd1EJGXFhJIlLEN/c2Z9svFnWhQiSlPQX0o1bK435gJQbd1I3B6O3I2TkLrQ==
-  dependencies:
-    "@0x/types" "^3.1.3"
-    "@0x/typescript-typings" "^5.1.0"
-    "@types/node" "*"
-    abortcontroller-polyfill "^1.1.9"
-    bignumber.js "~9.0.0"
-    chalk "^2.3.0"
-    detect-node "2.0.3"
-    ethereum-types "^3.1.1"
-    ethereumjs-util "^5.1.1"
-    ethers "~4.0.4"
-    isomorphic-fetch "2.2.1"
-    js-sha3 "^0.7.0"
-    lodash "^4.17.11"
-
 "@0x/utils@^5.5.1":
   version "5.5.1"
   resolved "https://registry.yarnpkg.com/@0x/utils/-/utils-5.5.1.tgz#5f131755e1692e7c7b74d03d224d94808d475dd7"
@@ -3750,14 +3711,6 @@ ethereum-types@^3.0.0, ethereum-types@^3.1.0:
     "@types/node" "*"
     bignumber.js "~9.0.0"
 
-ethereum-types@^3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/ethereum-types/-/ethereum-types-3.1.1.tgz#fc9ea72f0d4b93cd651e31ed79b9af4126e15f5a"
-  integrity sha512-4PRpHfzN4v+IhgrEOS4KYugtKliuDESGtWjmhpPmOC2RUilo6wQDYKK2PKaq4rYG+dzHxIfXrPh/AnQpRgSNhw==
-  dependencies:
-    "@types/node" "*"
-    bignumber.js "~9.0.0"
-
 ethereum-types@^3.2.0:
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/ethereum-types/-/ethereum-types-3.2.0.tgz#5bd27cadc3c1b3c2e2bf94654fa2bc3618a4520f"