Update yarn.lock for libsodium bump.

Author: sjudson

yarn.lock

@@ -77,15 +77,15 @@ inherits@2:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
 
-libsodium-sumo@0.7.3:
-  version "0.7.3"
-  resolved "https://registry.yarnpkg.com/libsodium-sumo/-/libsodium-sumo-0.7.3.tgz#c38d99dc3b2c056870ca8f3ac8f1ecbb150ecbbf"
+libsodium-sumo@0.7.4:
+  version "0.7.4"
+  resolved "https://registry.yarnpkg.com/libsodium-sumo/-/libsodium-sumo-0.7.4.tgz#fb99816dac06df5d34cd9e04a99253d23fc0d6bd"
 
-libsodium-wrappers-sumo@0.7.3:
-  version "0.7.3"
-  resolved "https://registry.yarnpkg.com/libsodium-wrappers-sumo/-/libsodium-wrappers-sumo-0.7.3.tgz#eeb4fc93a9802c34558e0f2ec350295ba6246fc8"
+libsodium-wrappers-sumo@0.7.4:
+  version "0.7.4"
+  resolved "https://registry.yarnpkg.com/libsodium-wrappers-sumo/-/libsodium-wrappers-sumo-0.7.4.tgz#68443ea2e57fb51e4aefb3f9487be7321fbaf68c"
   dependencies:
-    libsodium-sumo "0.7.3"
+    libsodium-sumo "0.7.4"
 
 minimatch@^3.0.4:
   version "3.0.4"