Remove babel-plugin-istanbul (vercel#5004)

This plugin is not in use.

https://github.com/zeit/next.js/search?q=istanbul&unscoped_q=istanbul

package.json

@@ -122,7 +122,6 @@
     "@zeit/next-typescript": "1.1.0",
     "babel-eslint": "8.2.2",
     "babel-jest": "21.2.0",
-    "babel-plugin-istanbul": "4.1.5",
     "babel-plugin-transform-remove-strict-mode": "0.0.2",
     "benchmark": "2.1.4",
     "cheerio": "0.22.0",

yarn.lock

@@ -1303,14 +1303,6 @@ babel-messages@^6.23.0:
   dependencies:
     babel-runtime "^6.22.0"
 
-[email protected]:
-  version "4.1.5"
-  resolved "https://registry.yarnpkg.com/babel-plugin-istanbul/-/babel-plugin-istanbul-4.1.5.tgz#6760cdd977f411d3e175bb064f2bc327d99b2b6e"
-  dependencies:
-    find-up "^2.1.0"
-    istanbul-lib-instrument "^1.7.5"
-    test-exclude "^4.1.1"
-
 babel-plugin-istanbul@^4.0.0:
   version "4.1.6"
   resolved "https://registry.yarnpkg.com/babel-plugin-istanbul/-/babel-plugin-istanbul-4.1.6.tgz#36c59b2192efce81c5b378321b74175add1c9a45"
@@ -1363,7 +1355,7 @@ babel-register@^6.26.0:
     mkdirp "^0.5.1"
     source-map-support "^0.4.15"
 
-babel-runtime@6.26.0, babel-runtime@^6.22.0, babel-runtime@^6.26.0:
+babel-runtime@^6.22.0, babel-runtime@^6.26.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-runtime/-/babel-runtime-6.26.0.tgz#965c7058668e82b55d7bfe04ff2337bc8b5647fe"
   dependencies:
@@ -4255,7 +4247,7 @@ istanbul-lib-hook@^1.2.0:
   dependencies:
     append-transform "^1.0.0"
 
-istanbul-lib-instrument@^1.10.1, istanbul-lib-instrument@^1.4.2, istanbul-lib-instrument@^1.7.5, istanbul-lib-instrument@^1.8.0:
+istanbul-lib-instrument@^1.10.1, istanbul-lib-instrument@^1.4.2, istanbul-lib-instrument@^1.8.0:
   version "1.10.1"
   resolved "https://registry.yarnpkg.com/istanbul-lib-instrument/-/istanbul-lib-instrument-1.10.1.tgz#724b4b6caceba8692d3f1f9d0727e279c401af7b"
   dependencies:
@@ -7152,16 +7144,20 @@ [email protected], source-map@^0.5.0, source-map@^0.5.3, source-map@^0.5.6, sourc
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
 
-source-map@0.6.1, source-map@^0.6.1, source-map@~0.6.1:
-  version "0.6.1"
-  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
+source-map@0.7.3:
+  version "0.7.3"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.7.3.tgz#5302f8169031735226544092e64981f751750383"
 
 source-map@^0.4.2, source-map@^0.4.4:
   version "0.4.4"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.4.4.tgz#eba4f5da9c0dc999de68032d8b4f76173652036b"
   dependencies:
     amdefine ">=0.0.4"
 
+source-map@^0.6.1, source-map@~0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
+
 spawn-wrap@^1.3.8:
   version "1.4.2"
   resolved "https://registry.yarnpkg.com/spawn-wrap/-/spawn-wrap-1.4.2.tgz#cff58e73a8224617b6561abdc32586ea0c82248c"
@@ -7408,26 +7404,26 @@ strip-json-comments@~2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
 
-styled-jsx@2.2.7:
-  version "2.2.7"
-  resolved "https://registry.yarnpkg.com/styled-jsx/-/styled-jsx-2.2.7.tgz#0ada82e2e4b8b59e38508a8e57258fd1f70e204a"
+styled-jsx@3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/styled-jsx/-/styled-jsx-3.0.2.tgz#8fd439a96602e890700092aec1af0b24123cd878"
   dependencies:
     babel-plugin-syntax-jsx "6.18.0"
-    babel-runtime "6.26.0"
     babel-types "6.26.0"
     convert-source-map "1.5.1"
-    source-map "0.6.1"
+    loader-utils "1.1.0"
+    source-map "0.7.3"
     string-hash "1.1.3"
-    stylis "3.5.1"
+    stylis "3.5.3"
     stylis-rule-sheet "0.0.10"
 
 [email protected]:
   version "0.0.10"
   resolved "https://registry.yarnpkg.com/stylis-rule-sheet/-/stylis-rule-sheet-0.0.10.tgz#44e64a2b076643f4b52e5ff71efc04d8c3c4a430"
 
-[email protected].1:
-  version "3.5.1"
-  resolved "https://registry.yarnpkg.com/stylis/-/stylis-3.5.1.tgz#fd341d59f57f9aeb412bc14c9d8a8670b438e03b"
+[email protected].3:
+  version "3.5.3"
+  resolved "https://registry.yarnpkg.com/stylis/-/stylis-3.5.3.tgz#99fdc46afba6af4deff570825994181a5e6ce546"
 
 supports-color@^2.0.0:
   version "2.0.0"