upgrade to webpack with acorn fix

packages/gatsby/package.json

@@ -126,7 +126,7 @@
     "util.promisify": "^1.0.0",
     "uuid": "^3.1.0",
     "v8-compile-cache": "^1.1.0",
-    "webpack": "^4.29.0",
+    "webpack": "^4.35.3",
     "webpack-dev-middleware": "^3.0.1",
     "webpack-dev-server": "^3.1.14",
     "webpack-hot-middleware": "^2.21.0",

yarn.lock

@@ -3234,11 +3234,6 @@ acorn-dynamic-import@^3.0.0:
   dependencies:
     acorn "^5.0.0"
 
-acorn-dynamic-import@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz#482210140582a36b83c3e342e1cfebcaa9240948"
-  integrity sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw==
-
 acorn-globals@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/acorn-globals/-/acorn-globals-4.1.0.tgz#ab716025dbe17c54d3ef81d32ece2b2d99fe2538"
@@ -3269,7 +3264,7 @@ acorn@^5.0.0, acorn@^5.2.1, acorn@^5.5.3, acorn@^5.6.2, acorn@^5.7.1:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
   integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
 
-acorn@^6.0.1, acorn@^6.0.4, acorn@^6.0.5, acorn@^6.0.7:
+acorn@^6.0.1, acorn@^6.0.4, acorn@^6.0.7:
   version "6.1.1"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.1.1.tgz#7d25ae05bb8ad1f9b699108e1094ecd7884adc1f"
   integrity sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA==
@@ -3279,6 +3274,11 @@ acorn@^6.0.2:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.0.5.tgz#81730c0815f3f3b34d8efa95cb7430965f4d887a"
   integrity sha512-i33Zgp3XWtmZBMNvCr4azvOFeWVw1Rk6p3hfi3LUDvIFraOMywb1kAtrbi+med14m4Xfpqm3zRZMT+c0FNE7kg==
 
+acorn@^6.2.0:
+  version "6.2.0"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.2.0.tgz#67f0da2fc339d6cfb5d6fb244fd449f33cd8bbe3"
+  integrity sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw==
+
 address@1.0.3, address@^1.0.1:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/address/-/address-1.0.3.tgz#b5f50631f8d6cec8bd20c963963afb55e06cbce9"
@@ -22376,17 +22376,16 @@ webpack@^4.14.0, webpack@^4.16.0:
     watchpack "^1.5.0"
     webpack-sources "^1.2.0"
 
-webpack@^4.29.0:
-  version "4.34.0"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.34.0.tgz#a4c30129482f7b4ece4c0842002dedf2b56fab58"
-  integrity sha512-ry2IQy1wJjOefLe1uJLzn5tG/DdIKzQqNlIAd2L84kcaADqNvQDTBlo8UcCNyDaT5FiaB+16jhAkb63YeG3H8Q==
+webpack@^4.35.3:
+  version "4.35.3"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.35.3.tgz#66bc35ef215a7b75e8790f84d560013ffecf0ca3"
+  integrity sha512-xggQPwr9ILlXzz61lHzjvgoqGU08v5+Wnut19Uv3GaTtzN4xBTcwnobodrXE142EL1tOiS5WVEButooGzcQzTA==
   dependencies:
     "@webassemblyjs/ast" "1.8.5"
     "@webassemblyjs/helper-module-context" "1.8.5"
     "@webassemblyjs/wasm-edit" "1.8.5"
     "@webassemblyjs/wasm-parser" "1.8.5"
-    acorn "^6.0.5"
-    acorn-dynamic-import "^4.0.0"
+    acorn "^6.2.0"
     ajv "^6.1.0"
     ajv-keywords "^3.1.0"
     chrome-trace-event "^1.0.0"