Update dependency query-string to v6

package.json

@@ -13,7 +13,7 @@
     "lodash": "4.17.4",
     "office-ui-fabric-js": "1.4.0",
     "papaparse": "4.3.6",
-    "query-string": "4.3.4",
+    "query-string": "6.9.0",
     "react": "16.6.0",
     "react-bootstrap": "0.32.4",
     "react-dom": "16.6.0",

yarn.lock

@@ -1918,6 +1918,10 @@ decamelize@^1.0.0, decamelize@^1.1.1, decamelize@^1.1.2:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
 
+decode-uri-component@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/decode-uri-component/-/decode-uri-component-0.2.0.tgz#eb3913333458775cb84cd1a1fae062106bb87545"
+
 deep-equal@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/deep-equal/-/deep-equal-1.0.1.tgz#f5d260292b660e084eff4cdbc9f08ad3247448b5"
@@ -5327,7 +5331,15 @@ [email protected], qs@~6.4.0:
   version "6.4.0"
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.4.0.tgz#13e26d28ad6b0ffaa91312cd3bf708ed351e7233"
 
-[email protected], query-string@^4.1.0:
+[email protected]:
+  version "6.9.0"
+  resolved "https://registry.yarnpkg.com/query-string/-/query-string-6.9.0.tgz#1c3b727c370cf00f177c99f328fda2108f8fa3dd"
+  dependencies:
+    decode-uri-component "^0.2.0"
+    split-on-first "^1.0.0"
+    strict-uri-encode "^2.0.0"
+
+query-string@^4.1.0:
   version "4.3.4"
   resolved "https://registry.yarnpkg.com/query-string/-/query-string-4.3.4.tgz#bbb693b9ca915c232515b228b1a02b609043dbeb"
   dependencies:
@@ -6223,6 +6235,10 @@ spdy@^3.4.1:
     select-hose "^2.0.0"
     spdy-transport "^2.0.18"
 
+split-on-first@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/split-on-first/-/split-on-first-1.1.0.tgz#f610afeee3b12bce1d0c30425e76398b78249a5f"
+
 sprintf-js@~1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
@@ -6281,6 +6297,10 @@ strict-uri-encode@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz#279b225df1d582b1f54e65addd4352e18faa0713"
 
+strict-uri-encode@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/strict-uri-encode/-/strict-uri-encode-2.0.0.tgz#b9c7330c7042862f6b142dc274bbcc5866ce3546"
+
 string-length@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/string-length/-/string-length-1.0.1.tgz#56970fb1c38558e9e70b728bf3de269ac45adfac"