Use caret operator in composer.json for all sub packages

https://getcomposer.org/doc/articles/versions.md#caret

src/Cache/composer.json

@@ -23,7 +23,7 @@
     },
     "require": {
         "php": ">=5.6.0",
-        "cakephp/core": "~3.0"
+        "cakephp/core": "^3.0.0"
     },
     "autoload": {
         "psr-4": {

src/Core/composer.json

@@ -23,7 +23,7 @@
     },
     "require": {
         "php": ">=5.6.0",
-        "cakephp/utility": "~3.0"
+        "cakephp/utility": "^3.0.0"
     },
     "autoload": {
         "psr-4": {

src/Database/composer.json

@@ -25,8 +25,8 @@
     },
     "require": {
         "php": ">=5.6.0",
-        "cakephp/core": "~3.0",
-        "cakephp/datasource": "~3.0"
+        "cakephp/core": "^3.0.0",
+        "cakephp/datasource": "^3.0.0"
     },
     "suggest": {
         "cakephp/log": "Require this if you want to use the built-in query logger",

src/Datasource/composer.json

@@ -25,7 +25,7 @@
     },
     "require": {
         "php": ">=5.6.0",
-        "cakephp/core": "~3.0"
+        "cakephp/core": "^3.0.0"
     },
     "suggest": {
         "cakephp/utility": "Require this if you decide to use EntityTrait",

src/Form/composer.json

@@ -22,7 +22,7 @@
     },
     "require": {
         "php": ">=5.6.0",
-        "cakephp/validation": "~3.0"
+        "cakephp/validation": "^3.0.0"
     },
     "autoload": {
         "psr-4": {

src/I18n/composer.json

@@ -29,7 +29,7 @@
     },
     "require": {
         "php": ">=5.6.0",
-        "cakephp/core": "~3.0",
+        "cakephp/core": "^3.0.0",
         "ext-intl": "*",
         "cakephp/chronos": "*",
         "aura/intl": "^3.0.0"

src/Log/composer.json

@@ -24,8 +24,8 @@
     },
     "require": {
         "php": ">=5.6.0",
-        "cakephp/core": "~3.0",
-        "psr/log": "^1.0"
+        "cakephp/core": "^3.0.0",
+        "psr/log": "^1.0.0"
     },
     "autoload": {
         "psr-4": {

src/ORM/composer.json

@@ -24,13 +24,13 @@
     },
     "require": {
         "php": ">=5.6.0",
-        "cakephp/collection": "~3.0",
-        "cakephp/core": "~3.0",
+        "cakephp/collection": "^3.0.0",
+        "cakephp/core": "^3.0.0",
         "cakephp/datasource": "^3.1.2",
         "cakephp/database": "^3.1.4",
-        "cakephp/event": "~3.0",
-        "cakephp/utility": "~3.0",
-        "cakephp/validation": "~3.0"
+        "cakephp/event": "^3.0.0",
+        "cakephp/utility": "^3.0.0",
+        "cakephp/validation": "^3.0.0"
     },
     "suggest": {
         "cakephp/i18n": "If you are using Translate / Timestamp Behavior."

src/Validation/composer.json

@@ -23,9 +23,9 @@
     },
     "require": {
         "php": ">=5.6.0",
-        "cakephp/utility": "~3.0",
-        "cakephp/i18n": "~3.0",
-        "psr/http-message": "~1.0"
+        "cakephp/utility": "^3.0.0",
+        "cakephp/i18n": "^3.0.0",
+        "psr/http-message": "^1.0.0"
     },
     "autoload": {
         "psr-4": {