Fix NPM dependencies security vulnerabilities

Fix some NPM dependencies security vulnerabilities found by GitHub
security alert bot.

.flowconfig

@@ -1,6 +1,7 @@
 [ignore]
 <PROJECT_ROOT>/node_modules/*
 <PROJECT_ROOT>/dist/.*
+<PROJECT_ROOT>/private/.*
 
 [libs]
 

package.json

@@ -113,6 +113,9 @@
     "webpack-blocks-split-vendor": "^0.2.1"
   },
   "resolutions": {
-    "mem": "^4.0.0"
+    "acorn": "^5.7.4",
+    "https-proxy-agent": "^2.2.3",
+    "mem": "^4.0.0",
+    "minimist": "^0.2.1"
   }
 }

yarn.lock

@@ -281,27 +281,10 @@ acorn-walk@^6.0.1:
   resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-6.2.0.tgz#123cb8f3b84c2171f1f7fb252615b1c78a6b1a8c"
   integrity sha512-7evsyfH1cLOCdAzZAd43Cic04yKydNx0cF+7tiA19p1XnLLPU4dpCQOqpjqwokFe//vS0QqfqqjCS2JkiIs0cA==
 
-acorn@^3.0.4:
-  version "3.3.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-3.3.0.tgz#45e37fb39e8da3f25baee3ff5369e2bb5f22017a"
-
-acorn@^4.0.3:
-  version "4.0.13"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-4.0.13.tgz#105495ae5361d697bd195c825192e1ad7f253787"
-
-acorn@^5.0.0, acorn@^5.1.1:
-  version "5.1.2"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.1.2.tgz#911cb53e036807cf0fa778dc5d370fbd864246d7"
-
-acorn@^5.5.3:
-  version "5.7.3"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
-  integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
-
-acorn@^6.0.1:
-  version "6.2.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.2.0.tgz#67f0da2fc339d6cfb5d6fb244fd449f33cd8bbe3"
-  integrity sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw==
+acorn@^3.0.4, acorn@^4.0.3, acorn@^5.0.0, acorn@^5.1.1, acorn@^5.5.3, acorn@^5.7.4, acorn@^6.0.1:
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
+  integrity sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==
 
 adal-node@^0.1.25:
   version "0.1.26"
@@ -317,12 +300,19 @@ adal-node@^0.1.25:
     xmldom ">= 0.1.x"
     xpath.js "~1.0.5"
 
-agent-base@4, agent-base@^4.1.0:
+agent-base@4:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/agent-base/-/agent-base-4.2.1.tgz#d89e5999f797875674c07d87f260fc41e83e8ca9"
   dependencies:
     es6-promisify "^5.0.0"
 
+agent-base@^4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/agent-base/-/agent-base-4.3.0.tgz#8165f01c436009bccad0b1d122f05ed770efc6ee"
+  integrity sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==
+  dependencies:
+    es6-promisify "^5.0.0"
+
 airbnb-js-shims@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/airbnb-js-shims/-/airbnb-js-shims-1.3.0.tgz#aac46d80057fb0b414f70e06d07e362fd99ee2fa"
@@ -4900,11 +4890,12 @@ https-browserify@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/https-browserify/-/https-browserify-0.0.1.tgz#3f91365cabe60b77ed0ebba24b454e3e09d95a82"
 
-https-proxy-agent@^2.2.0:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/https-proxy-agent/-/https-proxy-agent-2.2.1.tgz#51552970fa04d723e04c56d04178c3f92592bbc0"
+https-proxy-agent@^2.2.0, https-proxy-agent@^2.2.3:
+  version "2.2.4"
+  resolved "https://registry.yarnpkg.com/https-proxy-agent/-/https-proxy-agent-2.2.4.tgz#4ee7a737abd92678a293d9b34a1af4d0d08c787b"
+  integrity sha512-OmvfoQ53WLjtA9HeYP9RNrWMJzzAz1JGaSFr1nijg0PVR1JaD/xbJq1mdEIIlxGpXp9eSe/O2LgU9DJmTPd0Eg==
   dependencies:
-    agent-base "^4.1.0"
+    agent-base "^4.3.0"
     debug "^3.1.0"
 
 hyphenate-style-name@^1.0.1, hyphenate-style-name@^1.0.2:
@@ -6560,19 +6551,10 @@ minimatch@^3.0.0, minimatch@^3.0.2, minimatch@^3.0.3, minimatch@^3.0.4:
   dependencies:
     brace-expansion "^1.1.7"
 
-minimist@0.0.8:
-  version "0.0.8"
-  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
-  integrity sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=
-
-minimist@1.2.0, minimist@^1.1.1, minimist@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
-
-minimist@~0.0.1:
-  version "0.0.10"
-  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.10.tgz#de3f98543dbf96082be48ad1a0c7cda836301dcf"
-  integrity sha1-3j+YVD2/lggr5IrRoMfNqDYwHc8=
+minimist@0.0.8, minimist@1.2.0, minimist@^0.2.1, minimist@^1.1.1, minimist@^1.2.0, minimist@~0.0.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.2.1.tgz#827ba4e7593464e7c221e8c5bed930904ee2c455"
+  integrity sha512-GY8fANSrTMfBVfInqJAY41QkOM+upUTytK1jZ0c8+3HdHrJxBJ3rF5i9moClXTE8uUSnUo8cAsCoxDXvSY4DHg==
 
 minipass@^2.2.1, minipass@^2.3.5:
   version "2.3.5"