Bump rxjs from 5.4.3 to 6.4.0

Bumps [rxjs](https://github.com/reactivex/rxjs) from 5.4.3 to 6.4.0.
- [Release notes](https://github.com/reactivex/rxjs/releases)
- [Changelog](https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md)
- [Commits](ReactiveX/rxjs@5.4.3...6.4.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

package.json

@@ -62,7 +62,7 @@
     "react-json-view": "1.19.1",
     "react-remarkable": "1.1.3",
     "react-schema-form": "0.6.2",
-    "rxjs": "5.4.3",
+    "rxjs": "6.4.0",
     "uri-template": "1.0.1",
     "uuid": "3.3.2"
   },

yarn.lock

@@ -6709,11 +6709,12 @@ rx-lite@*, rx-lite@^4.0.8:
   version "4.0.8"
   resolved "https://registry.yarnpkg.com/rx-lite/-/rx-lite-4.0.8.tgz#0b1e11af8bc44836f04a6407e92da42467b79444"
 
-rxjs@5.4.3:
-  version "5.4.3"
-  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-5.4.3.tgz#0758cddee6033d68e0fd53676f0f3596ce3d483f"
+rxjs@6.4.0:
+  version "6.4.0"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-6.4.0.tgz#f3bb0fe7bda7fb69deac0c16f17b50b0b8790504"
+  integrity sha512-Z9Yfa11F6B9Sg/BK9MnqnQ+aQYicPLtilXBp2yUtDt2JRCE0h26d33EnfO3ZxoNxG0T92OUucP3Ct7cpfkdFfw==
   dependencies:
-    symbol-observable "^1.0.1"
+    tslib "^1.9.0"
 
 safe-buffer@5.1.2, safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.2"
@@ -7297,7 +7298,7 @@ symbol-observable@1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/symbol-observable/-/symbol-observable-1.0.4.tgz#29bf615d4aa7121bdd898b22d4b3f9bc4e2aa03d"
 
-symbol-observable@^1.0.1, symbol-observable@^1.0.4, symbol-observable@^1.1.0:
+symbol-observable@^1.0.4, symbol-observable@^1.1.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/symbol-observable/-/symbol-observable-1.2.0.tgz#c22688aed4eab3cdc2dfeacbb561660560a00804"
 
@@ -7491,7 +7492,7 @@ tsconfig-paths@^3.1.1:
     minimist "^1.2.0"
     strip-bom "^3.0.0"
 
-tslib@^1.8.0, tslib@^1.8.1:
+tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0:
   version "1.9.3"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.9.3.tgz#d7e4dd79245d85428c4d7e4822a79917954ca286"