Bump nexmo/client from 1.5.0 to 1.5.1

Bumps [nexmo/client](https://github.com/Nexmo/nexmo-php) from 1.5.0 to 1.5.1.
- [Release notes](https://github.com/Nexmo/nexmo-php/releases)
- [Commits](https://github.com/Nexmo/nexmo-php/compare/1.5.0...1.5.1)

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

composer.lock

@@ -2416,16 +2416,16 @@
         },
         {
             "name": "lcobucci/jwt",
-            "version": "3.2.4",
+            "version": "3.2.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/lcobucci/jwt.git",
-                "reference": "c9704b751315d21735dc98d78d4f37bd73596da7"
+                "reference": "82be04b4753f8b7693b62852b7eab30f97524f9b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/lcobucci/jwt/zipball/c9704b751315d21735dc98d78d4f37bd73596da7",
-                "reference": "c9704b751315d21735dc98d78d4f37bd73596da7",
+                "url": "https://api.github.com/repos/lcobucci/jwt/zipball/82be04b4753f8b7693b62852b7eab30f97524f9b",
+                "reference": "82be04b4753f8b7693b62852b7eab30f97524f9b",
                 "shasum": ""
             },
             "require": {
@@ -2462,7 +2462,7 @@
                 {
                     "name": "Luís Otávio Cobucci Oblonczyk",
                     "email": "lcobucci@gmail.com",
-                    "role": "developer"
+                    "role": "Developer"
                 }
             ],
             "description": "A simple library to work with JSON Web Token and JSON Web Signature",
@@ -2470,7 +2470,7 @@
                 "JWS",
                 "jwt"
             ],
-            "time": "2018-08-03T11:23:50+00:00"
+            "time": "2018-11-11T12:22:26+00:00"
         },
         {
             "name": "league/commonmark",
@@ -2881,16 +2881,16 @@
         },
         {
             "name": "nexmo/client",
-            "version": "1.5.0",
+            "version": "1.5.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Nexmo/nexmo-php.git",
-                "reference": "4a6ecf73f7ee79b861600cb84e8a44c8a3b3ef15"
+                "reference": "2c39e4a2d5d1a012cfe2510c1513817dd8ed7ad0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Nexmo/nexmo-php/zipball/4a6ecf73f7ee79b861600cb84e8a44c8a3b3ef15",
-                "reference": "4a6ecf73f7ee79b861600cb84e8a44c8a3b3ef15",
+                "url": "https://api.github.com/repos/Nexmo/nexmo-php/zipball/2c39e4a2d5d1a012cfe2510c1513817dd8ed7ad0",
+                "reference": "2c39e4a2d5d1a012cfe2510c1513817dd8ed7ad0",
                 "shasum": ""
             },
             "require": {
@@ -2901,7 +2901,7 @@
                 "zendframework/zend-diactoros": "^1.3"
             },
             "require-dev": {
-                "estahn/phpunit-json-assertions": "@stable",
+                "estahn/phpunit-json-assertions": "^1.0.0",
                 "php-http/mock-client": "^0.3.0",
                 "phpunit/phpunit": "^5.7",
                 "squizlabs/php_codesniffer": "^3.1"
@@ -2925,7 +2925,7 @@
                 }
             ],
             "description": "PHP Client for using Nexmo's API.",
-            "time": "2018-09-20T14:13:04+00:00"
+            "time": "2018-11-05T16:57:16+00:00"
         },
         {
             "name": "nikic/php-parser",
@@ -6951,9 +6951,7 @@
     ],
     "aliases": [],
     "minimum-stability": "dev",
-    "stability-flags": {
-        "nexmo/client": 10
-    },
+    "stability-flags": [],
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {